Reimplementation of classes Ip4Address/Ip6Address/Ip4Prefix/Ip6Prefix
and the corresponding unit tests.

* Reimplemented classes Ip4Address and Ip6Address by inheriting from
  class IpAddress
* Reimplemented classes Ip4Prefix and Ip6Prefix by inheriting from
  class IpPrefix
* Reimplemented the unit tests Ip4AddressTest and Ip6AddressTest to
  match the corresponding IpAddressTest unit tests
* Reimplemented the unit tests Ip4PrefixTest and Ip6PrefixTest to
  match the corresponding IpPrefixTest unit tests
* Minor refactoring/cleanup of classes IpAddress and IpPrefix
diff --git a/utils/misc/src/test/java/org/onlab/packet/Ip4AddressTest.java b/utils/misc/src/test/java/org/onlab/packet/Ip4AddressTest.java
index 36463cf..dd4c2d0 100644
--- a/utils/misc/src/test/java/org/onlab/packet/Ip4AddressTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/Ip4AddressTest.java
@@ -15,10 +15,13 @@
  */
 package org.onlab.packet;
 
+import com.google.common.net.InetAddresses;
+import com.google.common.testing.EqualsTester;
 import org.junit.Test;
 
+import java.net.InetAddress;
+
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
@@ -36,10 +39,18 @@
     }
 
     /**
+     * Tests the IPv4 address version constant.
+     */
+    @Test
+    public void testAddressVersion() {
+        assertThat(Ip4Address.VERSION, is(IpAddress.Version.INET));
+    }
+
+    /**
      * Tests the length of the address in bytes (octets).
      */
     @Test
-    public void testAddrBytelen() {
+    public void testAddrByteLength() {
         assertThat(Ip4Address.BYTE_LENGTH, is(4));
     }
 
@@ -47,299 +58,372 @@
      * Tests the length of the address in bits.
      */
     @Test
-    public void testAddrBitlen() {
+    public void testAddrBitLength() {
         assertThat(Ip4Address.BIT_LENGTH, is(32));
     }
 
     /**
-     * Tests default class constructor.
+     * Tests returning the IP address version.
      */
     @Test
-    public void testDefaultConstructor() {
-        Ip4Address ip4Address = new Ip4Address();
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+    public void testVersion() {
+        Ip4Address ipAddress;
+
+        // IPv4
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        assertThat(ipAddress.version(), is(IpAddress.Version.INET));
     }
 
     /**
-     * Tests valid class copy constructor.
+     * Tests returning an IPv4 address as a byte array.
      */
     @Test
-    public void testCopyConstructor() {
-        Ip4Address fromAddr = new Ip4Address("1.2.3.4");
-        Ip4Address ip4Address = new Ip4Address(fromAddr);
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
+    public void testAddressToOctetsIPv4() {
+        Ip4Address ipAddress;
+        byte[] value;
 
-        fromAddr = new Ip4Address("0.0.0.0");
-        ip4Address = new Ip4Address(fromAddr);
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+        value = new byte[] {1, 2, 3, 4};
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        assertThat(ipAddress.toOctets(), is(value));
 
-        fromAddr = new Ip4Address("255.255.255.255");
-        ip4Address = new Ip4Address(fromAddr);
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        value = new byte[] {0, 0, 0, 0};
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        assertThat(ipAddress.toOctets(), is(value));
+
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipAddress = Ip4Address.valueOf("255.255.255.255");
+        assertThat(ipAddress.toOctets(), is(value));
     }
 
     /**
-     * Tests invalid class copy constructor for a null object to copy from.
+     * Tests returning an IPv4 address as an integer.
      */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullObject() {
-        Ip4Address fromAddr = null;
-        Ip4Address ip4Address = new Ip4Address(fromAddr);
+    @Test
+    public void testToInt() {
+        Ip4Address ipAddress;
+
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        assertThat(ipAddress.toInt(), is(0x01020304));
+
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        assertThat(ipAddress.toInt(), is(0));
+
+        ipAddress = Ip4Address.valueOf("255.255.255.255");
+        assertThat(ipAddress.toInt(), is(-1));
     }
 
     /**
-     * Tests valid class constructor for an integer value.
+     * Tests valueOf() converter for IPv4 integer value.
      */
     @Test
-    public void testConstructorForInteger() {
-        Ip4Address ip4Address = new Ip4Address(0x01020304);
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
+    public void testValueOfForIntegerIPv4() {
+        Ip4Address ipAddress;
 
-        ip4Address = new Ip4Address(0);
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+        ipAddress = Ip4Address.valueOf(0x01020304);
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
 
-        ip4Address = new Ip4Address(0xffffffff);
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        ipAddress = Ip4Address.valueOf(0);
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        ipAddress = Ip4Address.valueOf(0xffffffff);
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
     /**
-     * Tests valid class constructor for an array value.
+     * Tests valueOf() converter for IPv4 byte array.
      */
     @Test
-    public void testConstructorForArray() {
+    public void testValueOfByteArrayIPv4() {
+        Ip4Address ipAddress;
+
         final byte[] value1 = new byte[] {1, 2, 3, 4};
-        Ip4Address ip4Address = new Ip4Address(value1);
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
+        ipAddress = Ip4Address.valueOf(value1);
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
 
         final byte[] value2 = new byte[] {0, 0, 0, 0};
-        ip4Address = new Ip4Address(value2);
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+        ipAddress = Ip4Address.valueOf(value2);
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
 
         final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
                                           (byte) 0xff, (byte) 0xff};
-        ip4Address = new Ip4Address(value3);
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        ipAddress = Ip4Address.valueOf(value3);
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
     /**
-     * Tests valid class constructor for an array value and an offset.
-     */
-    @Test
-    public void testConstructorForArrayAndOffset() {
-        final byte[] value1 = new byte[] {11, 22, 33,   // Preamble
-                                          1, 2, 3, 4,
-                                          44, 55};      // Extra bytes
-        Ip4Address ip4Address = new Ip4Address(value1, 3);
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
-
-        final byte[] value2 = new byte[] {11, 22,       // Preamble
-                                          0, 0, 0, 0,
-                                          33};          // Extra bytes
-        ip4Address = new Ip4Address(value2, 2);
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
-
-        final byte[] value3 = new byte[] {11, 22,       // Preamble
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          33};          // Extra bytes
-        ip4Address = new Ip4Address(value3, 2);
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
-    }
-
-    /**
-     * Tests invalid class constructor for a null array.
+     * Tests invalid valueOf() converter for a null array for IPv4.
      */
     @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullArray() {
+    public void testInvalidValueOfNullArrayIPv4() {
+        Ip4Address ipAddress;
+
         final byte[] fromArray = null;
-        Ip4Address ip4Address = new Ip4Address(fromArray);
+        ipAddress = Ip4Address.valueOf(fromArray);
     }
 
     /**
-     * Tests invalid class constructor for an array that is too short.
+     * Tests invalid valueOf() converger for an array that is too short for
+     * IPv4.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructorShortArray() {
+    public void testInvalidValueOfShortArrayIPv4() {
+        Ip4Address ipAddress;
+
         final byte[] fromArray = new byte[] {1, 2, 3};
-        Ip4Address ip4Address = new Ip4Address(fromArray);
+        ipAddress = Ip4Address.valueOf(fromArray);
     }
 
     /**
-     * Tests invalid class constructor for an array and an invalid offset.
-     */
-    @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructorArrayInvalidOffset() {
-        final byte[] value1 = new byte[] {11, 22, 33,   // Preamble
-                                          1, 2, 3, 4,
-                                          44, 55};      // Extra bytes
-        Ip4Address ip4Address = new Ip4Address(value1, 6);
-    }
-
-    /**
-     * Tests valid class constructor for a string.
+     * Tests valueOf() converter for IPv4 byte array and an offset.
      */
     @Test
-    public void testConstructorForString() {
-        Ip4Address ip4Address = new Ip4Address("1.2.3.4");
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
+    public void testValueOfByteArrayOffsetIPv4() {
+        Ip4Address ipAddress;
+        byte[] value;
 
-        ip4Address = new Ip4Address("0.0.0.0");
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            1, 2, 3, 4,
+                            44, 55};                    // Extra bytes
+        ipAddress = Ip4Address.valueOf(value, 3);
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
 
-        ip4Address = new Ip4Address("255.255.255.255");
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        value = new byte[] {11, 22,                     // Preamble
+                            0, 0, 0, 0,
+                            33};                        // Extra bytes
+        ipAddress = Ip4Address.valueOf(value, 2);
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        value = new byte[] {11, 22,                     // Preamble
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            33};                        // Extra bytes
+        ipAddress = Ip4Address.valueOf(value, 2);
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
     /**
-     * Tests invalid class constructor for a null string.
+     * Tests invalid valueOf() converger for an array and an invalid offset
+     * for IPv4.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfArrayInvalidOffsetIPv4() {
+        Ip4Address ipAddress;
+        byte[] value;
+
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            1, 2, 3, 4,
+                            44, 55};                    // Extra bytes
+        ipAddress = Ip4Address.valueOf(value, 6);
+    }
+
+    /**
+     * Tests valueOf() converter for IPv4 InetAddress.
+     */
+    @Test
+    public void testValueOfInetAddressIPv4() {
+        Ip4Address ipAddress;
+        InetAddress inetAddress;
+
+        inetAddress = InetAddresses.forString("1.2.3.4");
+        ipAddress = Ip4Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
+
+        inetAddress = InetAddresses.forString("0.0.0.0");
+        ipAddress = Ip4Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        inetAddress = InetAddresses.forString("255.255.255.255");
+        ipAddress = Ip4Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
+    }
+
+    /**
+     * Tests valueOf() converter for IPv4 string.
+     */
+    @Test
+    public void testValueOfStringIPv4() {
+        Ip4Address ipAddress;
+
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
+
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        ipAddress = Ip4Address.valueOf("255.255.255.255");
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
+    }
+
+    /**
+     * Tests invalid valueOf() converter for a null string.
      */
     @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullString() {
+    public void testInvalidValueOfNullString() {
+        Ip4Address ipAddress;
+
         String fromString = null;
-        Ip4Address ip4Address = new Ip4Address(fromString);
+        ipAddress = Ip4Address.valueOf(fromString);
     }
 
     /**
-     * Tests invalid class constructor for an empty string.
+     * Tests invalid valueOf() converter for an empty string.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructors() {
-        // Check constructor for invalid ID: empty string
-        Ip4Address ip4Address = new Ip4Address("");
+    public void testInvalidValueOfEmptyString() {
+        Ip4Address ipAddress;
+
+        String fromString = "";
+        ipAddress = Ip4Address.valueOf(fromString);
     }
 
     /**
-     * Tests returning the address as a byte array.
+     * Tests invalid valueOf() converter for an incorrect string.
      */
-    @Test
-    public void testAddressToOctets() {
-        final byte[] value1 = new byte[] {1, 2, 3, 4};
-        Ip4Address ip4Address = new Ip4Address("1.2.3.4");
-        assertThat(ip4Address.toOctets(), is(value1));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfIncorrectString() {
+        Ip4Address ipAddress;
 
-        final byte[] value2 = new byte[] {0, 0, 0, 0};
-        ip4Address = new Ip4Address("0.0.0.0");
-        assertThat(ip4Address.toOctets(), is(value2));
-
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
-        ip4Address = new Ip4Address("255.255.255.255");
-        assertThat(ip4Address.toOctets(), is(value3));
+        String fromString = "NoSuchIpAddress";
+        ipAddress = Ip4Address.valueOf(fromString);
     }
 
     /**
-     * Tests making a mask prefix for a given prefix length.
+     * Tests making a mask prefix for a given prefix length for IPv4.
      */
     @Test
-    public void testMakeMaskPrefix() {
-        Ip4Address ip4Address = Ip4Address.makeMaskPrefix(25);
-        assertThat(ip4Address.toString(), is("255.255.255.128"));
+    public void testMakeMaskPrefixIPv4() {
+        Ip4Address ipAddress;
 
-        ip4Address = Ip4Address.makeMaskPrefix(0);
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+        ipAddress = Ip4Address.makeMaskPrefix(25);
+        assertThat(ipAddress.toString(), is("255.255.255.128"));
 
-        ip4Address = Ip4Address.makeMaskPrefix(32);
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        ipAddress = Ip4Address.makeMaskPrefix(0);
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        ipAddress = Ip4Address.makeMaskPrefix(32);
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
     /**
-     * Tests making of a masked address.
+     * Tests making a mask prefix for an invalid prefix length for IPv4:
+     * negative prefix length.
      */
-    @Test
-    public void testMakeMaskedAddress() {
-        Ip4Address ip4Address = new Ip4Address("1.2.3.5");
-        Ip4Address ip4AddressMasked =
-            Ip4Address.makeMaskedAddress(ip4Address, 24);
-        assertThat(ip4AddressMasked.toString(), is("1.2.3.0"));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeNegativeMaskPrefixIPv4() {
+        Ip4Address ipAddress;
 
-        ip4AddressMasked = Ip4Address.makeMaskedAddress(ip4Address, 0);
-        assertThat(ip4AddressMasked.toString(), is("0.0.0.0"));
-
-        ip4AddressMasked = Ip4Address.makeMaskedAddress(ip4Address, 32);
-        assertThat(ip4AddressMasked.toString(), is("1.2.3.5"));
+        ipAddress = Ip4Address.makeMaskPrefix(-1);
     }
 
     /**
-     * Tests getting the value of an address.
+     * Tests making a mask prefix for an invalid prefix length for IPv4:
+     * too long prefix length.
      */
-    @Test
-    public void testGetValue() {
-        Ip4Address ip4Address = new Ip4Address("1.2.3.4");
-        assertThat(ip4Address.getValue(), is(0x01020304));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeTooLongMaskPrefixIPv4() {
+        Ip4Address ipAddress;
 
-        ip4Address = new Ip4Address("0.0.0.0");
-        assertThat(ip4Address.getValue(), is(0));
-
-        ip4Address = new Ip4Address("255.255.255.255");
-        assertThat(ip4Address.getValue(), is(-1));
+        ipAddress = Ip4Address.makeMaskPrefix(33);
     }
 
     /**
-     * Tests equality of {@link Ip4Address}.
+     * Tests making of a masked address for IPv4.
      */
     @Test
-    public void testEquality() {
-        Ip4Address addr1 = new Ip4Address("1.2.3.4");
-        Ip4Address addr2 = new Ip4Address("1.2.3.4");
-        assertThat(addr1, is(addr2));
+    public void testMakeMaskedAddressIPv4() {
+        Ip4Address ipAddress = Ip4Address.valueOf("1.2.3.5");
+        Ip4Address ipAddressMasked;
 
-        addr1 = new Ip4Address("0.0.0.0");
-        addr2 = new Ip4Address("0.0.0.0");
-        assertThat(addr1, is(addr2));
+        ipAddressMasked = Ip4Address.makeMaskedAddress(ipAddress, 24);
+        assertThat(ipAddressMasked.toString(), is("1.2.3.0"));
 
-        addr1 = new Ip4Address("255.255.255.255");
-        addr2 = new Ip4Address("255.255.255.255");
-        assertThat(addr1, is(addr2));
+        ipAddressMasked = Ip4Address.makeMaskedAddress(ipAddress, 0);
+        assertThat(ipAddressMasked.toString(), is("0.0.0.0"));
+
+        ipAddressMasked = Ip4Address.makeMaskedAddress(ipAddress, 32);
+        assertThat(ipAddressMasked.toString(), is("1.2.3.5"));
     }
 
     /**
-     * Tests non-equality of {@link Ip4Address}.
+     * Tests making of a masked address for invalid prefix length for IPv4:
+     * negative prefix length.
      */
-    @Test
-    public void testNonEquality() {
-        Ip4Address addr1 = new Ip4Address("1.2.3.4");
-        Ip4Address addr2 = new Ip4Address("1.2.3.5");
-        Ip4Address addr3 = new Ip4Address("0.0.0.0");
-        Ip4Address addr4 = new Ip4Address("255.255.255.255");
-        assertThat(addr1, is(not(addr2)));
-        assertThat(addr3, is(not(addr2)));
-        assertThat(addr4, is(not(addr2)));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeNegativeMaskedAddressIPv4() {
+        Ip4Address ipAddress = Ip4Address.valueOf("1.2.3.5");
+        Ip4Address ipAddressMasked;
+
+        ipAddressMasked = Ip4Address.makeMaskedAddress(ipAddress, -1);
     }
 
     /**
-     * Tests comparison of {@link Ip4Address}.
+     * Tests making of a masked address for an invalid prefix length for IPv4:
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeTooLongMaskedAddressIPv4() {
+        Ip4Address ipAddress = Ip4Address.valueOf("1.2.3.5");
+        Ip4Address ipAddressMasked;
+
+        ipAddressMasked = Ip4Address.makeMaskedAddress(ipAddress, 33);
+    }
+
+    /**
+     * Tests comparison of {@link Ip4Address} for IPv4.
      */
     @Test
-    public void testComparison() {
-        Ip4Address addr1 = new Ip4Address("1.2.3.4");
-        Ip4Address addr2 = new Ip4Address("1.2.3.4");
-        Ip4Address addr3 = new Ip4Address("1.2.3.3");
-        Ip4Address addr4 = new Ip4Address("1.2.3.5");
+    public void testComparisonIPv4() {
+        Ip4Address addr1, addr2, addr3, addr4;
+
+        addr1 = Ip4Address.valueOf("1.2.3.4");
+        addr2 = Ip4Address.valueOf("1.2.3.4");
+        addr3 = Ip4Address.valueOf("1.2.3.3");
+        addr4 = Ip4Address.valueOf("1.2.3.5");
         assertTrue(addr1.compareTo(addr2) == 0);
         assertTrue(addr1.compareTo(addr3) > 0);
         assertTrue(addr1.compareTo(addr4) < 0);
 
-        addr1 = new Ip4Address("255.2.3.4");
-        addr2 = new Ip4Address("255.2.3.4");
-        addr3 = new Ip4Address("255.2.3.3");
-        addr4 = new Ip4Address("255.2.3.5");
+        addr1 = Ip4Address.valueOf("255.2.3.4");
+        addr2 = Ip4Address.valueOf("255.2.3.4");
+        addr3 = Ip4Address.valueOf("255.2.3.3");
+        addr4 = Ip4Address.valueOf("255.2.3.5");
         assertTrue(addr1.compareTo(addr2) == 0);
         assertTrue(addr1.compareTo(addr3) > 0);
         assertTrue(addr1.compareTo(addr4) < 0);
     }
 
     /**
-     * Tests object string representation.
+     * Tests equality of {@link Ip4Address} for IPv4.
      */
     @Test
-    public void testToString() {
-        Ip4Address ip4Address = new Ip4Address("1.2.3.4");
-        assertThat(ip4Address.toString(), is("1.2.3.4"));
+    public void testEqualityIPv4() {
+        new EqualsTester()
+            .addEqualityGroup(Ip4Address.valueOf("1.2.3.4"),
+                              Ip4Address.valueOf("1.2.3.4"))
+            .addEqualityGroup(Ip4Address.valueOf("1.2.3.5"),
+                              Ip4Address.valueOf("1.2.3.5"))
+            .addEqualityGroup(Ip4Address.valueOf("0.0.0.0"),
+                              Ip4Address.valueOf("0.0.0.0"))
+            .addEqualityGroup(Ip4Address.valueOf("255.255.255.255"),
+                              Ip4Address.valueOf("255.255.255.255"))
+            .testEquals();
+    }
 
-        ip4Address = new Ip4Address("0.0.0.0");
-        assertThat(ip4Address.toString(), is("0.0.0.0"));
+    /**
+     * Tests object string representation for IPv4.
+     */
+    @Test
+    public void testToStringIPv4() {
+        Ip4Address ipAddress;
 
-        ip4Address = new Ip4Address("255.255.255.255");
-        assertThat(ip4Address.toString(), is("255.255.255.255"));
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        assertThat(ipAddress.toString(), is("1.2.3.4"));
+
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        assertThat(ipAddress.toString(), is("0.0.0.0"));
+
+        ipAddress = Ip4Address.valueOf("255.255.255.255");
+        assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 }
diff --git a/utils/misc/src/test/java/org/onlab/packet/Ip4PrefixTest.java b/utils/misc/src/test/java/org/onlab/packet/Ip4PrefixTest.java
index 84ef0b3..c731ed6 100644
--- a/utils/misc/src/test/java/org/onlab/packet/Ip4PrefixTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/Ip4PrefixTest.java
@@ -15,12 +15,14 @@
  */
 package org.onlab.packet;
 
+import com.google.common.testing.EqualsTester;
 import org.junit.Test;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
 
 /**
@@ -36,175 +38,497 @@
     }
 
     /**
-     * Tests default class constructor.
+     * Tests the IPv4 prefix address version constant.
      */
     @Test
-    public void testDefaultConstructor() {
-        Ip4Prefix ip4prefix = new Ip4Prefix();
-        assertThat(ip4prefix.toString(), is("0.0.0.0/0"));
+    public void testAddressVersion() {
+        assertThat(Ip4Prefix.VERSION, is(IpAddress.Version.INET));
     }
 
     /**
-     * Tests valid class copy constructor.
+     * Tests the maximum mask length.
      */
     @Test
-    public void testCopyConstructor() {
-        Ip4Prefix fromAddr = new Ip4Prefix("1.2.3.0/24");
-        Ip4Prefix ip4prefix = new Ip4Prefix(fromAddr);
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
-
-        fromAddr = new Ip4Prefix("0.0.0.0/0");
-        ip4prefix = new Ip4Prefix(fromAddr);
-        assertThat(ip4prefix.toString(), is("0.0.0.0/0"));
-
-        fromAddr = new Ip4Prefix("255.255.255.255/32");
-        ip4prefix = new Ip4Prefix(fromAddr);
-        assertThat(ip4prefix.toString(), is("255.255.255.255/32"));
+    public void testMaxMaskLength() {
+        assertThat(Ip4Prefix.MAX_MASK_LENGTH, is(32));
     }
 
     /**
-     * Tests invalid class copy constructor for a null object to copy from.
-     */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullObject() {
-        Ip4Prefix fromAddr = null;
-        Ip4Prefix ip4prefix = new Ip4Prefix(fromAddr);
-    }
-
-    /**
-     * Tests valid class constructor for an address and prefix length.
+     * Tests returning the IP version of the prefix.
      */
     @Test
-    public void testConstructorForAddressAndPrefixLength() {
-        Ip4Prefix ip4prefix =
-            new Ip4Prefix(new Ip4Address("1.2.3.0"), (short) 24);
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
+    public void testVersion() {
+        Ip4Prefix ipPrefix;
 
-        ip4prefix = new Ip4Prefix(new Ip4Address("1.2.3.4"), (short) 24);
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
-
-        ip4prefix = new Ip4Prefix(new Ip4Address("1.2.3.5"), (short) 32);
-        assertThat(ip4prefix.toString(), is("1.2.3.5/32"));
-
-        ip4prefix = new Ip4Prefix(new Ip4Address("0.0.0.0"), (short) 0);
-        assertThat(ip4prefix.toString(), is("0.0.0.0/0"));
-
-        ip4prefix =
-            new Ip4Prefix(new Ip4Address("255.255.255.255"), (short) 32);
-        assertThat(ip4prefix.toString(), is("255.255.255.255/32"));
+        // IPv4
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertThat(ipPrefix.version(), is(IpAddress.Version.INET));
     }
 
     /**
-     * Tests valid class constructor for a string.
+     * Tests returning the IP address value and IP address prefix length of
+     * an IPv4 prefix.
      */
     @Test
-    public void testConstructorForString() {
-        Ip4Prefix ip4prefix = new Ip4Prefix("1.2.3.0/24");
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
+    public void testAddressAndPrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
 
-        ip4prefix = new Ip4Prefix("1.2.3.4/24");
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.0/24");
+        assertThat(ipPrefix.address(), equalTo(Ip4Address.valueOf("1.2.3.0")));
+        assertThat(ipPrefix.prefixLength(), is(24));
 
-        ip4prefix = new Ip4Prefix("1.2.3.5/32");
-        assertThat(ip4prefix.toString(), is("1.2.3.5/32"));
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/24");
+        assertThat(ipPrefix.address(), equalTo(Ip4Address.valueOf("1.2.3.0")));
+        assertThat(ipPrefix.prefixLength(), is(24));
 
-        ip4prefix = new Ip4Prefix("0.0.0.0/0");
-        assertThat(ip4prefix.toString(), is("0.0.0.0/0"));
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/32");
+        assertThat(ipPrefix.address(), equalTo(Ip4Address.valueOf("1.2.3.4")));
+        assertThat(ipPrefix.prefixLength(), is(32));
 
-        ip4prefix = new Ip4Prefix("255.255.255.255/32");
-        assertThat(ip4prefix.toString(), is("255.255.255.255/32"));
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.5/32");
+        assertThat(ipPrefix.address(), equalTo(Ip4Address.valueOf("1.2.3.5")));
+        assertThat(ipPrefix.prefixLength(), is(32));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertThat(ipPrefix.address(), equalTo(Ip4Address.valueOf("0.0.0.0")));
+        assertThat(ipPrefix.prefixLength(), is(0));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/32");
+        assertThat(ipPrefix.address(),
+                   equalTo(Ip4Address.valueOf("255.255.255.255")));
+        assertThat(ipPrefix.prefixLength(), is(32));
     }
 
     /**
-     * Tests invalid class constructor for a null string.
+     * Tests valueOf() converter for IPv4 integer value.
      */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullString() {
-        String fromString = null;
-        Ip4Prefix ip4prefix = new Ip4Prefix(fromString);
+    @Test
+    public void testValueOfForIntegerIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf(0x01020304, 24);
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
+
+        ipPrefix = Ip4Prefix.valueOf(0x01020304, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.4/32"));
+
+        ipPrefix = Ip4Prefix.valueOf(0x01020305, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.5/32"));
+
+        ipPrefix = Ip4Prefix.valueOf(0, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(0, 32);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/32"));
+
+        ipPrefix = Ip4Prefix.valueOf(0xffffffff, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(0xffffffff, 16);
+        assertThat(ipPrefix.toString(), is("255.255.0.0/16"));
+
+        ipPrefix = Ip4Prefix.valueOf(0xffffffff, 32);
+        assertThat(ipPrefix.toString(), is("255.255.255.255/32"));
     }
 
     /**
-     * Tests invalid class constructor for an empty string.
+     * Tests invalid valueOf() converter for IPv4 integer value and
+     * negative prefix length.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructors() {
-        // Check constructor for invalid ID: empty string
-        Ip4Prefix ip4prefix = new Ip4Prefix("");
+    public void testInvalidValueOfIntegerNegativePrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf(0x01020304, -1);
     }
 
     /**
-     * Tests getting the value of an address.
+     * Tests invalid valueOf() converter for IPv4 integer value and
+     * too long prefix length.
      */
-    @Test
-    public void testGetValue() {
-        Ip4Prefix ip4prefix = new Ip4Prefix("1.2.3.0/24");
-        assertThat(ip4prefix.getAddress(), equalTo(new Ip4Address("1.2.3.0")));
-        assertThat(ip4prefix.getPrefixLen(), is((short) 24));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfIntegerTooLongPrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
 
-        ip4prefix = new Ip4Prefix("0.0.0.0/0");
-        assertThat(ip4prefix.getAddress(), equalTo(new Ip4Address("0.0.0.0")));
-        assertThat(ip4prefix.getPrefixLen(), is((short) 0));
-
-        ip4prefix = new Ip4Prefix("255.255.255.255/32");
-        assertThat(ip4prefix.getAddress(),
-                   equalTo(new Ip4Address("255.255.255.255")));
-        assertThat(ip4prefix.getPrefixLen(), is((short) 32));
+        ipPrefix = Ip4Prefix.valueOf(0x01020304, 33);
     }
 
     /**
-     * Tests equality of {@link Ip4Address}.
+     * Tests valueOf() converter for IPv4 byte array.
      */
     @Test
-    public void testEquality() {
-        Ip4Prefix addr1net = new Ip4Prefix("1.2.3.0/24");
-        Ip4Prefix addr2net = new Ip4Prefix("1.2.3.0/24");
-        assertThat(addr1net, is(addr2net));
+    public void testValueOfByteArrayIPv4() {
+        Ip4Prefix ipPrefix;
+        byte[] value;
 
-        addr1net = new Ip4Prefix("1.2.3.0/24");
-        addr2net = new Ip4Prefix("1.2.3.4/24");
-        assertThat(addr1net, is(addr2net));
+        value = new byte[] {1, 2, 3, 4};
+        ipPrefix = Ip4Prefix.valueOf(value, 24);
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
 
-        addr1net = new Ip4Prefix("0.0.0.0/0");
-        addr2net = new Ip4Prefix("0.0.0.0/0");
-        assertThat(addr1net, is(addr2net));
+        ipPrefix = Ip4Prefix.valueOf(value, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.4/32"));
 
-        addr1net = new Ip4Prefix("255.255.255.255/32");
-        addr2net = new Ip4Prefix("255.255.255.255/32");
-        assertThat(addr1net, is(addr2net));
+        value = new byte[] {1, 2, 3, 5};
+        ipPrefix = Ip4Prefix.valueOf(value, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.5/32"));
+
+        value = new byte[] {0, 0, 0, 0};
+        ipPrefix = Ip4Prefix.valueOf(value, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(value, 32);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/32"));
+
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipPrefix = Ip4Prefix.valueOf(value, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(value, 16);
+        assertThat(ipPrefix.toString(), is("255.255.0.0/16"));
+
+        ipPrefix = Ip4Prefix.valueOf(value, 32);
+        assertThat(ipPrefix.toString(), is("255.255.255.255/32"));
     }
 
     /**
-     * Tests non-equality of {@link Ip4Address}.
+     * Tests invalid valueOf() converter for a null array for IPv4.
      */
-    @Test
-    public void testNonEquality() {
-        Ip4Prefix addr1net = new Ip4Prefix("1.2.0.0/16");
-        Ip4Prefix addr2net = new Ip4Prefix("1.3.0.0/16");
-        Ip4Prefix addr3net = new Ip4Prefix("1.3.0.0/24");
-        Ip4Prefix addr4net = new Ip4Prefix("0.0.0.0/0");
-        Ip4Prefix addr5net = new Ip4Prefix("255.255.255.255/32");
-        assertThat(addr1net, is(not(addr2net)));
-        assertThat(addr3net, is(not(addr2net)));
-        assertThat(addr4net, is(not(addr2net)));
-        assertThat(addr5net, is(not(addr2net)));
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullArrayIPv4() {
+        Ip4Prefix ipPrefix;
+        byte[] value;
+
+        value = null;
+        ipPrefix = Ip4Prefix.valueOf(value, 24);
     }
 
     /**
-     * Tests object string representation.
+     * Tests invalid valueOf() converter for a short array for IPv4.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfShortArrayIPv4() {
+        Ip4Prefix ipPrefix;
+        byte[] value;
+
+        value = new byte[] {1, 2, 3};
+        ipPrefix = Ip4Prefix.valueOf(value, 24);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 byte array and
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfByteArrayNegativePrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
+        byte[] value;
+
+        value = new byte[] {1, 2, 3, 4};
+        ipPrefix = Ip4Prefix.valueOf(value, -1);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 byte array and
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfByteArrayTooLongPrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
+        byte[] value;
+
+        value = new byte[] {1, 2, 3, 4};
+        ipPrefix = Ip4Prefix.valueOf(value, 33);
+    }
+
+    /**
+     * Tests valueOf() converter for IPv4 address.
      */
     @Test
-    public void testToString() {
-        Ip4Prefix ip4prefix = new Ip4Prefix("1.2.3.0/24");
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
+    public void testValueOfAddressIPv4() {
+        Ip4Address ipAddress;
+        Ip4Prefix ipPrefix;
 
-        ip4prefix = new Ip4Prefix("1.2.3.4/24");
-        assertThat(ip4prefix.toString(), is("1.2.3.0/24"));
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 24);
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
 
-        ip4prefix = new Ip4Prefix("0.0.0.0/0");
-        assertThat(ip4prefix.toString(), is("0.0.0.0/0"));
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.4/32"));
 
-        ip4prefix = new Ip4Prefix("255.255.255.255/32");
-        assertThat(ip4prefix.toString(), is("255.255.255.255/32"));
+        ipAddress = Ip4Address.valueOf("1.2.3.5");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 32);
+        assertThat(ipPrefix.toString(), is("1.2.3.5/32"));
+
+        ipAddress = Ip4Address.valueOf("0.0.0.0");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 32);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/32"));
+
+        ipAddress = Ip4Address.valueOf("255.255.255.255");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 0);
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 16);
+        assertThat(ipPrefix.toString(), is("255.255.0.0/16"));
+
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 32);
+        assertThat(ipPrefix.toString(), is("255.255.255.255/32"));
+    }
+
+    /**
+     * Tests invalid valueOf() converter for a null IP address.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullAddress() {
+        Ip4Address ipAddress;
+        Ip4Prefix ipPrefix;
+
+        ipAddress = null;
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 24);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 address and
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfAddressNegativePrefixLengthIPv4() {
+        Ip4Address ipAddress;
+        Ip4Prefix ipPrefix;
+
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, -1);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 address and
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfAddressTooLongPrefixLengthIPv4() {
+        Ip4Address ipAddress;
+        Ip4Prefix ipPrefix;
+
+        ipAddress = Ip4Address.valueOf("1.2.3.4");
+        ipPrefix = Ip4Prefix.valueOf(ipAddress, 33);
+    }
+
+    /**
+     * Tests valueOf() converter for IPv4 string.
+     */
+    @Test
+    public void testValueOfStringIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/24");
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/32");
+        assertThat(ipPrefix.toString(), is("1.2.3.4/32"));
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.5/32");
+        assertThat(ipPrefix.toString(), is("1.2.3.5/32"));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/32");
+        assertThat(ipPrefix.toString(), is("0.0.0.0/32"));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/0");
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/16");
+        assertThat(ipPrefix.toString(), is("255.255.0.0/16"));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/32");
+        assertThat(ipPrefix.toString(), is("255.255.255.255/32"));
+    }
+
+    /**
+     * Tests invalid valueOf() converter for a null string.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullString() {
+        Ip4Prefix ipPrefix;
+        String fromString;
+
+        fromString = null;
+        ipPrefix = Ip4Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an empty string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfEmptyString() {
+        Ip4Prefix ipPrefix;
+        String fromString;
+
+        fromString = "";
+        ipPrefix = Ip4Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an incorrect string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfIncorrectString() {
+        Ip4Prefix ipPrefix;
+        String fromString;
+
+        fromString = "NoSuchIpPrefix";
+        ipPrefix = Ip4Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 string and
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfStringNegativePrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/-1");
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv4 string and
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfStringTooLongPrefixLengthIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/33");
+    }
+
+    /**
+     * Tests IP prefix contains another IP prefix for IPv4.
+     */
+    @Test
+    public void testContainsIpPrefixIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.0.0/24");
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/24")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/32")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.4/32")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.3.0.0/24")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/0")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("255.255.255.255/32")));
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.0.0/32");
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/24")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/32")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.4/32")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.3.0.0/24")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/0")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("255.255.255.255/32")));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/24")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/32")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.4/32")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/16")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("1.3.0.0/24")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/16")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/0")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("255.255.255.255/32")));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/32");
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/24")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/32")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.4/32")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.2.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("1.3.0.0/24")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/16")));
+        assertFalse(ipPrefix.contains(Ip4Prefix.valueOf("0.0.0.0/0")));
+        assertTrue(ipPrefix.contains(Ip4Prefix.valueOf("255.255.255.255/32")));
+    }
+
+    /**
+     * Tests IP prefix contains IP address for IPv4.
+     */
+    @Test
+    public void testContainsIpAddressIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.0.0/24");
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.2.0.0")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.2.0.4")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.3.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("0.0.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("255.255.255.255")));
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.0.0/32");
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.2.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.2.0.4")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.3.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("0.0.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("255.255.255.255")));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.2.0.0")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.2.0.4")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("1.3.0.0")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("0.0.0.0")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("255.255.255.255")));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/32");
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.2.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.2.0.4")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("1.3.0.0")));
+        assertFalse(ipPrefix.contains(Ip4Address.valueOf("0.0.0.0")));
+        assertTrue(ipPrefix.contains(Ip4Address.valueOf("255.255.255.255")));
+    }
+
+    /**
+     * Tests equality of {@link Ip4Prefix} for IPv4.
+     */
+    @Test
+    public void testEqualityIPv4() {
+        new EqualsTester()
+            .addEqualityGroup(Ip4Prefix.valueOf("1.2.0.0/24"),
+                              Ip4Prefix.valueOf("1.2.0.0/24"),
+                              Ip4Prefix.valueOf("1.2.0.4/24"))
+            .addEqualityGroup(Ip4Prefix.valueOf("1.2.0.0/16"),
+                              Ip4Prefix.valueOf("1.2.0.0/16"))
+            .addEqualityGroup(Ip4Prefix.valueOf("1.2.0.0/32"),
+                              Ip4Prefix.valueOf("1.2.0.0/32"))
+            .addEqualityGroup(Ip4Prefix.valueOf("1.3.0.0/24"),
+                              Ip4Prefix.valueOf("1.3.0.0/24"))
+            .addEqualityGroup(Ip4Prefix.valueOf("0.0.0.0/0"),
+                              Ip4Prefix.valueOf("0.0.0.0/0"))
+            .addEqualityGroup(Ip4Prefix.valueOf("255.255.255.255/32"),
+                              Ip4Prefix.valueOf("255.255.255.255/32"))
+            .testEquals();
+    }
+
+    /**
+     * Tests object string representation for IPv4.
+     */
+    @Test
+    public void testToStringIPv4() {
+        Ip4Prefix ipPrefix;
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.0/24");
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
+
+        ipPrefix = Ip4Prefix.valueOf("1.2.3.4/24");
+        assertThat(ipPrefix.toString(), is("1.2.3.0/24"));
+
+        ipPrefix = Ip4Prefix.valueOf("0.0.0.0/0");
+        assertThat(ipPrefix.toString(), is("0.0.0.0/0"));
+
+        ipPrefix = Ip4Prefix.valueOf("255.255.255.255/32");
+        assertThat(ipPrefix.toString(), is("255.255.255.255/32"));
     }
 }
diff --git a/utils/misc/src/test/java/org/onlab/packet/Ip6AddressTest.java b/utils/misc/src/test/java/org/onlab/packet/Ip6AddressTest.java
index 9170461..c33cf1a 100644
--- a/utils/misc/src/test/java/org/onlab/packet/Ip6AddressTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/Ip6AddressTest.java
@@ -15,10 +15,13 @@
  */
 package org.onlab.packet;
 
+import com.google.common.net.InetAddresses;
+import com.google.common.testing.EqualsTester;
 import org.junit.Test;
 
+import java.net.InetAddress;
+
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
@@ -36,10 +39,18 @@
     }
 
     /**
+     * Tests the IPv4 address version constant.
+     */
+    @Test
+    public void testAddressVersion() {
+        assertThat(Ip6Address.VERSION, is(IpAddress.Version.INET6));
+    }
+
+    /**
      * Tests the length of the address in bytes (octets).
      */
     @Test
-    public void testAddrBytelen() {
+    public void testAddrByteLength() {
         assertThat(Ip6Address.BYTE_LENGTH, is(16));
     }
 
@@ -47,406 +58,440 @@
      * Tests the length of the address in bits.
      */
     @Test
-    public void testAddrBitlen() {
+    public void testAddrBitLength() {
         assertThat(Ip6Address.BIT_LENGTH, is(128));
     }
 
     /**
-     * Tests default class constructor.
+     * Tests returning the IP address version.
      */
     @Test
-    public void testDefaultConstructor() {
-        Ip6Address ip6Address = new Ip6Address();
-        assertThat(ip6Address.toString(), is("::"));
+    public void testVersion() {
+        IpAddress ipAddress;
+
+        // IPv6
+        ipAddress = IpAddress.valueOf("::");
+        assertThat(ipAddress.version(), is(IpAddress.Version.INET6));
     }
 
     /**
-     * Tests valid class copy constructor.
+     * Tests returning an IPv6 address as a byte array.
      */
     @Test
-    public void testCopyConstructor() {
-        Ip6Address fromAddr =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        Ip6Address ip6Address = new Ip6Address(fromAddr);
-        assertThat(ip6Address.toString(),
+    public void testAddressToOctetsIPv6() {
+        Ip6Address ipAddress;
+        byte[] value;
+
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88};
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        assertThat(ipAddress.toOctets(), is(value));
+
+        value = new byte[] {0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00};
+        ipAddress = Ip6Address.valueOf("::");
+        assertThat(ipAddress.toOctets(), is(value));
+
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipAddress =
+            Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        assertThat(ipAddress.toOctets(), is(value));
+    }
+
+    /**
+     * Tests valueOf() converter for IPv6 byte array.
+     */
+    @Test
+    public void testValueOfByteArrayIPv6() {
+        Ip6Address ipAddress;
+        byte[] value;
+
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88};
+        ipAddress = Ip6Address.valueOf(value);
+        assertThat(ipAddress.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        fromAddr = new Ip6Address("::");
-        ip6Address = new Ip6Address(fromAddr);
-        assertThat(ip6Address.toString(), is("::"));
+        value = new byte[] {0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00};
+        ipAddress = Ip6Address.valueOf(value);
+        assertThat(ipAddress.toString(), is("::"));
 
-        fromAddr = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        ip6Address = new Ip6Address(fromAddr);
-        assertThat(ip6Address.toString(),
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipAddress = Ip6Address.valueOf(value);
+        assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
 
     /**
-     * Tests invalid class copy constructor for a null object to copy from.
+     * Tests invalid valueOf() converter for a null array for IPv6.
      */
     @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullObject() {
-        Ip6Address fromAddr = null;
-        Ip6Address ip6Address = new Ip6Address(fromAddr);
-    }
+    public void testInvalidValueOfNullArrayIPv6() {
+        Ip6Address ipAddress;
 
-    /**
-     * Tests valid class constructor for integer values.
-     */
-    @Test
-    public void testConstructorForInteger() {
-        Ip6Address ip6Address =
-            new Ip6Address(0x1111222233334444L, 0x5555666677778888L);
-        assertThat(ip6Address.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8888"));
-
-        ip6Address = new Ip6Address(0L, 0L);
-        assertThat(ip6Address.toString(), is("::"));
-
-        ip6Address = new Ip6Address(-1L, -1L);
-        assertThat(ip6Address.toString(),
-                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
-    }
-
-    /**
-     * Tests valid class constructor for an array value.
-     */
-    @Test
-    public void testConstructorForArray() {
-        final byte[] value1 = new byte[] {0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88};
-        Ip6Address ip6Address = new Ip6Address(value1);
-        assertThat(ip6Address.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8888"));
-
-        final byte[] value2 = new byte[] {0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00};
-        ip6Address = new Ip6Address(value2);
-        assertThat(ip6Address.toString(), is("::"));
-
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
-        ip6Address = new Ip6Address(value3);
-        assertThat(ip6Address.toString(),
-                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
-    }
-
-    /**
-     * Tests valid class constructor for an array value and an offset.
-     */
-    @Test
-    public void testConstructorForArrayAndOffset() {
-        final byte[] value1 = new byte[] {11, 22, 33,           // Preamble
-                                          0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88,
-                                          44, 55};              // Extra bytes
-        Ip6Address ip6Address = new Ip6Address(value1, 3);
-        assertThat(ip6Address.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8888"));
-
-        final byte[] value2 = new byte[] {11, 22,               // Preamble
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          33};                  // Extra bytes
-        ip6Address = new Ip6Address(value2, 2);
-        assertThat(ip6Address.toString(), is("::"));
-
-        final byte[] value3 = new byte[] {11, 22,               // Preamble
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          33};                  // Extra bytes
-        ip6Address = new Ip6Address(value3, 2);
-        assertThat(ip6Address.toString(),
-                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
-    }
-
-    /**
-     * Tests invalid class constructor for a null array.
-     */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullArray() {
         final byte[] fromArray = null;
-        Ip6Address ip6Address = new Ip6Address(fromArray);
+        ipAddress = Ip6Address.valueOf(fromArray);
     }
 
     /**
-     * Tests invalid class constructor for an array that is too short.
+     * Tests invalid valueOf() converger for an array that is too short for
+     * IPv6.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructorShortArray() {
+    public void testInvalidValueOfShortArrayIPv6() {
+        Ip6Address ipAddress;
+
         final byte[] fromArray = new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9};
-        Ip6Address ip6Address = new Ip6Address(fromArray);
+        ipAddress = Ip6Address.valueOf(fromArray);
     }
 
     /**
-     * Tests invalid class constructor for an array and an invalid offset.
-     */
-    @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructorArrayInvalidOffset() {
-        final byte[] value1 = new byte[] {11, 22, 33,           // Preamble
-                                          0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88,
-                                          44, 55};              // Extra bytes
-        Ip6Address ip6Address = new Ip6Address(value1, 6);
-    }
-
-    /**
-     * Tests valid class constructor for a string.
+     * Tests valueOf() converter for IPv6 byte array and an offset.
      */
     @Test
-    public void testConstructorForString() {
-        Ip6Address ip6Address =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(ip6Address.toString(),
+    public void testValueOfByteArrayOffsetIPv6() {
+        Ip6Address ipAddress;
+        byte[] value;
+
+        value = new byte[] {11, 22, 33,                         // Preamble
+                            0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88,
+                            44, 55};                            // Extra bytes
+        ipAddress = Ip6Address.valueOf(value, 3);
+        assertThat(ipAddress.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        ip6Address = new Ip6Address("::");
-        assertThat(ip6Address.toString(), is("::"));
+        value = new byte[] {11, 22,                             // Preamble
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            33};                                // Extra bytes
+        ipAddress = Ip6Address.valueOf(value, 2);
+        assertThat(ipAddress.toString(), is("::"));
 
-        ip6Address = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(ip6Address.toString(),
+        value = new byte[] {11, 22,                             // Preamble
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            33};                                // Extra bytes
+        ipAddress = Ip6Address.valueOf(value, 2);
+        assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
 
     /**
-     * Tests invalid class constructor for a null string.
-     */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullString() {
-        String fromString = null;
-        Ip6Address ip6Address = new Ip6Address(fromString);
-    }
-
-    /**
-     * Tests invalid class constructor for an empty string.
+     * Tests invalid valueOf() converger for an array and an invalid offset
+     * for IPv6.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructors() {
-        // Check constructor for invalid ID: empty string
-        Ip6Address ip6Address = new Ip6Address("");
+    public void testInvalidValueOfArrayInvalidOffsetIPv6() {
+        Ip6Address ipAddress;
+        byte[] value;
+
+        value = new byte[] {11, 22, 33,                         // Preamble
+                            0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88,
+                            44, 55};                            // Extra bytes
+        ipAddress = Ip6Address.valueOf(value, 6);
     }
 
     /**
-     * Tests returning the address as a byte array.
+     * Tests valueOf() converter for IPv6 InetAddress.
      */
     @Test
-    public void testAddressToOctets() {
-        final byte[] value1 = new byte[] {0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88};
-        Ip6Address ip6Address =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(ip6Address.toOctets(), is(value1));
+    public void testValueOfInetAddressIPv6() {
+        Ip6Address ipAddress;
+        InetAddress inetAddress;
 
-        final byte[] value2 = new byte[] {0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00};
-        ip6Address = new Ip6Address("::");
-        assertThat(ip6Address.toOctets(), is(value2));
+        inetAddress =
+            InetAddresses.forString("1111:2222:3333:4444:5555:6666:7777:8888");
+        ipAddress = Ip6Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
-        ip6Address = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(ip6Address.toOctets(), is(value3));
+        inetAddress = InetAddresses.forString("::");
+        ipAddress = Ip6Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(), is("::"));
+
+        inetAddress =
+            InetAddresses.forString("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        ipAddress = Ip6Address.valueOf(inetAddress);
+        assertThat(ipAddress.toString(),
+                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
 
     /**
-     * Tests making a mask prefix for a given prefix length.
+     * Tests valueOf() converter for IPv6 string.
      */
     @Test
-    public void testMakeMaskPrefix() {
-        Ip6Address ip6Address = Ip6Address.makeMaskPrefix(8);
-        assertThat(ip6Address.toString(), is("ff00::"));
+    public void testValueOfStringIPv6() {
+        Ip6Address ipAddress;
 
-        ip6Address = Ip6Address.makeMaskPrefix(120);
-        assertThat(ip6Address.toString(),
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        assertThat(ipAddress.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8888"));
+
+        ipAddress = Ip6Address.valueOf("::");
+        assertThat(ipAddress.toString(), is("::"));
+
+        ipAddress =
+            Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        assertThat(ipAddress.toString(),
+                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
+    }
+
+    /**
+     * Tests invalid valueOf() converter for a null string.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullString() {
+        Ip6Address ipAddress;
+
+        String fromString = null;
+        ipAddress = Ip6Address.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an empty string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfEmptyString() {
+        Ip6Address ipAddress;
+
+        String fromString = "";
+        ipAddress = Ip6Address.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an incorrect string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfIncorrectString() {
+        Ip6Address ipAddress;
+
+        String fromString = "NoSuchIpAddress";
+        ipAddress = Ip6Address.valueOf(fromString);
+    }
+
+    /**
+     * Tests making a mask prefix for a given prefix length for IPv6.
+     */
+    @Test
+    public void testMakeMaskPrefixIPv6() {
+        Ip6Address ipAddress;
+
+        ipAddress = Ip6Address.makeMaskPrefix(8);
+        assertThat(ipAddress.toString(), is("ff00::"));
+
+        ipAddress = Ip6Address.makeMaskPrefix(120);
+        assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00"));
 
-        ip6Address = Ip6Address.makeMaskPrefix(0);
-        assertThat(ip6Address.toString(), is("::"));
+        ipAddress = Ip6Address.makeMaskPrefix(0);
+        assertThat(ipAddress.toString(), is("::"));
 
-        ip6Address = Ip6Address.makeMaskPrefix(128);
-        assertThat(ip6Address.toString(),
+        ipAddress = Ip6Address.makeMaskPrefix(128);
+        assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
 
-        ip6Address = Ip6Address.makeMaskPrefix(64);
-        assertThat(ip6Address.toString(), is("ffff:ffff:ffff:ffff::"));
+        ipAddress = Ip6Address.makeMaskPrefix(64);
+        assertThat(ipAddress.toString(), is("ffff:ffff:ffff:ffff::"));
     }
 
     /**
-     * Tests making of a masked address.
+     * Tests making a mask prefix for an invalid prefix length for IPv6:
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeNegativeMaskPrefixIPv6() {
+        Ip6Address ipAddress;
+
+        ipAddress = Ip6Address.makeMaskPrefix(-1);
+    }
+
+    /**
+     * Tests making a mask prefix for an invalid prefix length for IPv6:
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeTooLongMaskPrefixIPv6() {
+        Ip6Address ipAddress;
+
+        ipAddress = Ip6Address.makeMaskPrefix(129);
+    }
+
+    /**
+     * Tests making of a masked address for IPv6.
      */
     @Test
-    public void testMakeMaskedAddress() {
-        Ip6Address ip6Address =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8885");
-        Ip6Address ip6AddressMasked =
-            Ip6Address.makeMaskedAddress(ip6Address, 8);
-        assertThat(ip6AddressMasked.toString(), is("1100::"));
+    public void testMakeMaskedAddressIPv6() {
+        Ip6Address ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8885");
+        Ip6Address ipAddressMasked;
 
-        ip6AddressMasked = Ip6Address.makeMaskedAddress(ip6Address, 120);
-        assertThat(ip6AddressMasked.toString(),
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 8);
+        assertThat(ipAddressMasked.toString(), is("1100::"));
+
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 120);
+        assertThat(ipAddressMasked.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8800"));
 
-        ip6AddressMasked = Ip6Address.makeMaskedAddress(ip6Address, 0);
-        assertThat(ip6AddressMasked.toString(), is("::"));
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 0);
+        assertThat(ipAddressMasked.toString(), is("::"));
 
-        ip6AddressMasked = Ip6Address.makeMaskedAddress(ip6Address, 128);
-        assertThat(ip6AddressMasked.toString(),
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 128);
+        assertThat(ipAddressMasked.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8885"));
 
-        ip6AddressMasked = Ip6Address.makeMaskedAddress(ip6Address, 64);
-        assertThat(ip6AddressMasked.toString(), is("1111:2222:3333:4444::"));
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 64);
+        assertThat(ipAddressMasked.toString(), is("1111:2222:3333:4444::"));
     }
 
     /**
-     * Tests getting the value of an address.
+     * Tests making of a masked address for invalid prefix length for IPv6:
+     * negative prefix length.
      */
-    @Test
-    public void testGetValue() {
-        Ip6Address ip6Address =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(ip6Address.getValueHigh(), is(0x1111222233334444L));
-        assertThat(ip6Address.getValueLow(), is(0x5555666677778888L));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeNegativeMaskedAddressIPv6() {
+        Ip6Address ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8885");
+        Ip6Address ipAddressMasked;
 
-        ip6Address = new Ip6Address(0, 0);
-        assertThat(ip6Address.getValueHigh(), is(0L));
-        assertThat(ip6Address.getValueLow(), is(0L));
-
-        ip6Address = new Ip6Address(-1L, -1L);
-        assertThat(ip6Address.getValueHigh(), is(-1L));
-        assertThat(ip6Address.getValueLow(), is(-1L));
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, -1);
     }
 
     /**
-     * Tests equality of {@link Ip6Address}.
+     * Tests making of a masked address for an invalid prefix length for IPv6:
+     * too long prefix length.
      */
-    @Test
-    public void testEquality() {
-        Ip6Address addr1 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        Ip6Address addr2 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(addr1, is(addr2));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidMakeTooLongMaskedAddressIPv6() {
+        Ip6Address ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8885");
+        Ip6Address ipAddressMasked;
 
-        addr1 = new Ip6Address("::");
-        addr2 = new Ip6Address("::");
-        assertThat(addr1, is(addr2));
-
-        addr1 = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        addr2 = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(addr1, is(addr2));
+        ipAddressMasked = Ip6Address.makeMaskedAddress(ipAddress, 129);
     }
 
     /**
-     * Tests non-equality of {@link Ip6Address}.
+     * Tests comparison of {@link Ip6Address} for IPv6.
      */
     @Test
-    public void testNonEquality() {
-        Ip6Address addr1 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        Ip6Address addr2 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:888A");
-        Ip6Address addr3 = new Ip6Address("::");
-        Ip6Address addr4 =
-            new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(addr1, is(not(addr2)));
-        assertThat(addr3, is(not(addr2)));
-        assertThat(addr4, is(not(addr2)));
-    }
+    public void testComparisonIPv6() {
+        Ip6Address addr1, addr2, addr3, addr4;
 
-    /**
-     * Tests comparison of {@link Ip6Address}.
-     */
-    @Test
-    public void testComparison() {
-        Ip6Address addr1 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        Ip6Address addr2 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        Ip6Address addr3 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8887");
-        Ip6Address addr4 =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8889");
+        addr1 = Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        addr2 = Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        addr3 = Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8887");
+        addr4 = Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8889");
         assertTrue(addr1.compareTo(addr2) == 0);
         assertTrue(addr1.compareTo(addr3) > 0);
         assertTrue(addr1.compareTo(addr4) < 0);
 
-        addr1 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8888");
-        addr2 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8888");
-        addr3 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8887");
-        addr4 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8889");
+        addr1 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8888");
+        addr2 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8888");
+        addr3 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8887");
+        addr4 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8889");
         assertTrue(addr1.compareTo(addr2) == 0);
         assertTrue(addr1.compareTo(addr3) > 0);
         assertTrue(addr1.compareTo(addr4) < 0);
 
-        addr1 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8888");
-        addr2 = new Ip6Address("ffff:2222:3333:4444:5555:6666:7777:8888");
-        addr3 = new Ip6Address("ffff:2222:3333:4443:5555:6666:7777:8888");
-        addr4 = new Ip6Address("ffff:2222:3333:4445:5555:6666:7777:8888");
+        addr1 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8888");
+        addr2 = Ip6Address.valueOf("ffff:2222:3333:4444:5555:6666:7777:8888");
+        addr3 = Ip6Address.valueOf("ffff:2222:3333:4443:5555:6666:7777:8888");
+        addr4 = Ip6Address.valueOf("ffff:2222:3333:4445:5555:6666:7777:8888");
         assertTrue(addr1.compareTo(addr2) == 0);
         assertTrue(addr1.compareTo(addr3) > 0);
         assertTrue(addr1.compareTo(addr4) < 0);
     }
 
     /**
-     * Tests object string representation.
+     * Tests equality of {@link Ip6Address} for IPv6.
      */
     @Test
-    public void testToString() {
-        Ip6Address ip6Address =
-            new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(ip6Address.toString(),
+    public void testEqualityIPv6() {
+        new EqualsTester()
+            .addEqualityGroup(
+                Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888"),
+                Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888"))
+            .addEqualityGroup(
+                Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:888a"),
+                Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:888a"))
+            .addEqualityGroup(
+                Ip6Address.valueOf("::"),
+                Ip6Address.valueOf("::"))
+            .addEqualityGroup(
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"),
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"))
+            .testEquals();
+    }
+
+    /**
+     * Tests object string representation for IPv6.
+     */
+    @Test
+    public void testToStringIPv6() {
+        Ip6Address ipAddress;
+
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        assertThat(ipAddress.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        ip6Address = new Ip6Address("1111::8888");
-        assertThat(ip6Address.toString(), is("1111::8888"));
+        ipAddress = Ip6Address.valueOf("1111::8888");
+        assertThat(ipAddress.toString(), is("1111::8888"));
 
-        ip6Address = new Ip6Address("1111::");
-        assertThat(ip6Address.toString(), is("1111::"));
+        ipAddress = Ip6Address.valueOf("1111::");
+        assertThat(ipAddress.toString(), is("1111::"));
 
-        ip6Address = new Ip6Address("::8888");
-        assertThat(ip6Address.toString(), is("::8888"));
+        ipAddress = Ip6Address.valueOf("::8888");
+        assertThat(ipAddress.toString(), is("::8888"));
 
-        ip6Address = new Ip6Address("::");
-        assertThat(ip6Address.toString(), is("::"));
+        ipAddress = Ip6Address.valueOf("::");
+        assertThat(ipAddress.toString(), is("::"));
 
-        ip6Address = new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(ip6Address.toString(),
+        ipAddress =
+            Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
 }
diff --git a/utils/misc/src/test/java/org/onlab/packet/Ip6PrefixTest.java b/utils/misc/src/test/java/org/onlab/packet/Ip6PrefixTest.java
index 59b19f6..dceeb84 100644
--- a/utils/misc/src/test/java/org/onlab/packet/Ip6PrefixTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/Ip6PrefixTest.java
@@ -15,12 +15,14 @@
  */
 package org.onlab.packet;
 
+import com.google.common.testing.EqualsTester;
 import org.junit.Test;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
 
 /**
@@ -36,235 +38,531 @@
     }
 
     /**
-     * Tests default class constructor.
+     * Tests the IPv4 prefix address version constant.
      */
     @Test
-    public void testDefaultConstructor() {
-        Ip6Prefix ip6prefix = new Ip6Prefix();
-        assertThat(ip6prefix.toString(), is("::/0"));
+    public void testAddressVersion() {
+        assertThat(Ip6Prefix.VERSION, is(IpAddress.Version.INET6));
     }
 
     /**
-     * Tests valid class copy constructor.
+     * Tests the maximum mask length.
      */
     @Test
-    public void testCopyConstructor() {
-        Ip6Prefix fromAddr = new Ip6Prefix("1100::/8");
-        Ip6Prefix ip6prefix = new Ip6Prefix(fromAddr);
-        assertThat(ip6prefix.toString(), is("1100::/8"));
-
-        fromAddr = new Ip6Prefix("::/0");
-        ip6prefix = new Ip6Prefix(fromAddr);
-        assertThat(ip6prefix.toString(), is("::/0"));
-
-        fromAddr =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        ip6prefix = new Ip6Prefix(fromAddr);
-        assertThat(ip6prefix.toString(),
-                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
+    public void testMaxMaskLength() {
+        assertThat(Ip6Prefix.MAX_MASK_LENGTH, is(128));
     }
 
     /**
-     * Tests invalid class copy constructor for a null object to copy from.
+     * Tests returning the IP version of the prefix.
      */
-    @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullObject() {
-        Ip6Prefix fromAddr = null;
-        Ip6Prefix ip6prefix = new Ip6Prefix(fromAddr);
+    @Test
+    public void testVersion() {
+        Ip6Prefix ipPrefix;
+
+        // IPv6
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertThat(ipPrefix.version(), is(IpAddress.Version.INET6));
     }
 
     /**
-     * Tests valid class constructor for an address and prefix length.
+     * Tests returning the IP address value and IP address prefix length of
+     * an IPv6 prefix.
      */
     @Test
-    public void testConstructorForAddressAndPrefixLength() {
-        Ip6Prefix ip6prefix =
-            new Ip6Prefix(new Ip6Address("1100::"), (short) 8);
-        assertThat(ip6prefix.toString(), is("1100::/8"));
+    public void testAddressAndPrefixLengthIPv6() {
+        Ip6Prefix ipPrefix;
 
-        ip6prefix =
-            new Ip6Prefix(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8885"),
-                        (short) 8);
-        assertThat(ip6prefix.toString(), is("1100::/8"));
+        ipPrefix = Ip6Prefix.valueOf("1100::/8");
+        assertThat(ipPrefix.address(), equalTo(Ip6Address.valueOf("1100::")));
+        assertThat(ipPrefix.prefixLength(), is(8));
 
-        ip6prefix =
-            new Ip6Prefix(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8800"),
-                        (short) 120);
-        assertThat(ip6prefix.toString(),
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8885/8");
+        assertThat(ipPrefix.address(), equalTo(Ip6Address.valueOf("1100::")));
+        assertThat(ipPrefix.prefixLength(), is(8));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8800/120");
+        assertThat(ipPrefix.address(),
+                   equalTo(Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8800")));
+        assertThat(ipPrefix.prefixLength(), is(120));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8885/128");
+        assertThat(ipPrefix.address(),
+                   equalTo(Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8885")));
+        assertThat(ipPrefix.prefixLength(), is(128));
+
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertThat(ipPrefix.address(), equalTo(Ip6Address.valueOf("::")));
+        assertThat(ipPrefix.prefixLength(), is(0));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
+        assertThat(ipPrefix.address(),
+                   equalTo(Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+        assertThat(ipPrefix.prefixLength(), is(128));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8885/64");
+        assertThat(ipPrefix.address(),
+                   equalTo(Ip6Address.valueOf("1111:2222:3333:4444::")));
+        assertThat(ipPrefix.prefixLength(), is(64));
+    }
+
+    /**
+     * Tests valueOf() converter for IPv6 byte array.
+     */
+    @Test
+    public void testValueOfByteArrayIPv6() {
+        Ip6Prefix ipPrefix;
+        byte[] value;
+
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77, (byte) 0x88, (byte) 0x88};
+        ipPrefix = Ip6Prefix.valueOf(value, 120);
+        assertThat(ipPrefix.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8800/120"));
 
-        ip6prefix = new Ip6Prefix(new Ip6Address("::"), (short) 0);
-        assertThat(ip6prefix.toString(), is("::/0"));
+        ipPrefix = Ip6Prefix.valueOf(value, 128);
+        assertThat(ipPrefix.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8888/128"));
 
-        ip6prefix =
-            new Ip6Prefix(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8885"),
-                        (short) 128);
-        assertThat(ip6prefix.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8885/128"));
+        value = new byte[] {0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00};
+        ipPrefix = Ip6Prefix.valueOf(value, 0);
+        assertThat(ipPrefix.toString(), is("::/0"));
 
-        ip6prefix =
-            new Ip6Prefix(new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"),
-                        (short) 128);
-        assertThat(ip6prefix.toString(),
+        ipPrefix = Ip6Prefix.valueOf(value, 128);
+        assertThat(ipPrefix.toString(), is("::/128"));
+
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipPrefix = Ip6Prefix.valueOf(value, 0);
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix = Ip6Prefix.valueOf(value, 64);
+        assertThat(ipPrefix.toString(), is("ffff:ffff:ffff:ffff::/64"));
+
+        ipPrefix = Ip6Prefix.valueOf(value, 128);
+        assertThat(ipPrefix.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
-
-        ip6prefix =
-            new Ip6Prefix(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8885"),
-                        (short) 64);
-        assertThat(ip6prefix.toString(), is("1111:2222:3333:4444::/64"));
     }
 
     /**
-     * Tests valid class constructor for a string.
-     */
-    @Test
-    public void testConstructorForString() {
-        Ip6Prefix ip6prefix = new Ip6Prefix("1100::/8");
-        assertThat(ip6prefix.toString(), is("1100::/8"));
-
-        ip6prefix = new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/8");
-        assertThat(ip6prefix.toString(), is("1100::/8"));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8800/120");
-        assertThat(ip6prefix.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8800/120"));
-
-        ip6prefix = new Ip6Prefix("::/0");
-        assertThat(ip6prefix.toString(), is("::/0"));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/128");
-        assertThat(ip6prefix.toString(),
-                   is("1111:2222:3333:4444:5555:6666:7777:8885/128"));
-
-        ip6prefix = new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        assertThat(ip6prefix.toString(),
-                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/64");
-        assertThat(ip6prefix.toString(), is("1111:2222:3333:4444::/64"));
-    }
-
-    /**
-     * Tests invalid class constructor for a null string.
+     * Tests invalid valueOf() converter for a null array for IPv6.
      */
     @Test(expected = NullPointerException.class)
-    public void testInvalidConstructorNullString() {
-        String fromString = null;
-        Ip6Prefix ip6prefix = new Ip6Prefix(fromString);
+    public void testInvalidValueOfNullArrayIPv6() {
+        Ip6Prefix ipPrefix;
+        byte[] value;
+
+        value = null;
+        ipPrefix = Ip6Prefix.valueOf(value, 120);
     }
 
     /**
-     * Tests invalid class constructor for an empty string.
+     * Tests invalid valueOf() converter for a short array for IPv6.
      */
     @Test(expected = IllegalArgumentException.class)
-    public void testInvalidConstructors() {
-        // Check constructor for invalid ID: empty string
-        Ip6Prefix ip6prefix = new Ip6Prefix("");
+    public void testInvalidValueOfShortArrayIPv6() {
+        Ip6Prefix ipPrefix;
+        byte[] value;
+
+        value = new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9};
+        ipPrefix = Ip6Prefix.valueOf(value, 120);
     }
 
     /**
-     * Tests getting the value of an address.
+     * Tests invalid valueOf() converter for IPv6 byte array and
+     * negative prefix length.
      */
-    @Test
-    public void testGetValue() {
-        Ip6Prefix ip6prefix = new Ip6Prefix("1100::/8");
-        assertThat(ip6prefix.getAddress(), equalTo(new Ip6Address("1100::")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 8));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfByteArrayNegativePrefixLengthIPv6() {
+        Ip6Prefix ipPrefix;
+        byte[] value;
 
-        ip6prefix = new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/8");
-        assertThat(ip6prefix.getAddress(), equalTo(new Ip6Address("1100::")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 8));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8800/120");
-        assertThat(ip6prefix.getAddress(),
-                   equalTo(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8800")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 120));
-
-        ip6prefix = new Ip6Prefix("::/0");
-        assertThat(ip6prefix.getAddress(), equalTo(new Ip6Address("::")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 0));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/128");
-        assertThat(ip6prefix.getAddress(),
-                   equalTo(new Ip6Address("1111:2222:3333:4444:5555:6666:7777:8885")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 128));
-
-        ip6prefix =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        assertThat(ip6prefix.getAddress(),
-                   equalTo(new Ip6Address("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 128));
-
-        ip6prefix =
-            new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/64");
-        assertThat(ip6prefix.getAddress(),
-                   equalTo(new Ip6Address("1111:2222:3333:4444::")));
-        assertThat(ip6prefix.getPrefixLen(), is((short) 64));
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77, (byte) 0x88, (byte) 0x88};
+        ipPrefix = Ip6Prefix.valueOf(value, -1);
     }
 
     /**
-     * Tests equality of {@link Ip6Address}.
+     * Tests invalid valueOf() converter for IPv6 byte array and
+     * too long prefix length.
      */
-    @Test
-    public void testEquality() {
-        Ip6Prefix addr1net = new Ip6Prefix("1100::/8");
-        Ip6Prefix addr2net = new Ip6Prefix("1100::/8");
-        assertThat(addr1net, is(addr2net));
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfByteArrayTooLongPrefixLengthIPv6() {
+        Ip6Prefix ipPrefix;
+        byte[] value;
 
-        addr1net = new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/8");
-        addr2net = new Ip6Prefix("1100::/8");
-        assertThat(addr1net, is(addr2net));
-
-        addr1net = new Ip6Prefix("::/0");
-        addr2net = new Ip6Prefix("::/0");
-        assertThat(addr1net, is(addr2net));
-
-        addr1net =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        addr2net =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        assertThat(addr1net, is(addr2net));
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77, (byte) 0x88, (byte) 0x88};
+        ipPrefix = Ip6Prefix.valueOf(value, 129);
     }
 
     /**
-     * Tests non-equality of {@link Ip6Address}.
+     * Tests valueOf() converter for IPv6 address.
      */
     @Test
-    public void testNonEquality() {
-        Ip6Prefix addr1net = new Ip6Prefix("1100::/8");
-        Ip6Prefix addr2net = new Ip6Prefix("1200::/8");
-        Ip6Prefix addr3net = new Ip6Prefix("1200::/12");
-        Ip6Prefix addr4net = new Ip6Prefix("::/0");
-        Ip6Prefix addr5net =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        assertThat(addr1net, is(not(addr2net)));
-        assertThat(addr3net, is(not(addr2net)));
-        assertThat(addr4net, is(not(addr2net)));
-        assertThat(addr5net, is(not(addr2net)));
+    public void testValueOfAddressIPv6() {
+        Ip6Address ipAddress;
+        Ip6Prefix ipPrefix;
+
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 120);
+        assertThat(ipPrefix.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8800/120"));
+
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 128);
+        assertThat(ipPrefix.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8888/128"));
+
+        ipAddress = Ip6Address.valueOf("::");
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 0);
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 128);
+        assertThat(ipPrefix.toString(), is("::/128"));
+
+        ipAddress =
+            Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 0);
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 64);
+        assertThat(ipPrefix.toString(), is("ffff:ffff:ffff:ffff::/64"));
+
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 128);
+        assertThat(ipPrefix.toString(),
+                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
     }
 
     /**
-     * Tests object string representation.
+     * Tests invalid valueOf() converter for a null IP address.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullAddress() {
+        Ip6Address ipAddress;
+        Ip6Prefix ipPrefix;
+
+        ipAddress = null;
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 24);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv6 address and
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfAddressNegativePrefixLengthIPv6() {
+        Ip6Address ipAddress;
+        Ip6Prefix ipPrefix;
+
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, -1);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv6 address and
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfAddressTooLongPrefixLengthIPv6() {
+        Ip6Address ipAddress;
+        Ip6Prefix ipPrefix;
+
+        ipAddress =
+            Ip6Address.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
+        ipPrefix = Ip6Prefix.valueOf(ipAddress, 129);
+    }
+
+    /**
+     * Tests valueOf() converter for IPv6 string.
      */
     @Test
-    public void testToString() {
-        Ip6Prefix ip6prefix = new Ip6Prefix("1100::/8");
-        assertThat(ip6prefix.toString(), is("1100::/8"));
+    public void testValueOfStringIPv6() {
+        Ip6Prefix ipPrefix;
 
-        ip6prefix = new Ip6Prefix("1111:2222:3333:4444:5555:6666:7777:8885/8");
-        assertThat(ip6prefix.toString(), is("1100::/8"));
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8888/120");
+        assertThat(ipPrefix.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8800/120"));
 
-        ip6prefix = new Ip6Prefix("::/0");
-        assertThat(ip6prefix.toString(), is("::/0"));
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8888/128");
+        assertThat(ipPrefix.toString(),
+                   is("1111:2222:3333:4444:5555:6666:7777:8888/128"));
 
-        ip6prefix =
-            new Ip6Prefix("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
-        assertThat(ip6prefix.toString(),
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix = Ip6Prefix.valueOf("::/128");
+        assertThat(ipPrefix.toString(), is("::/128"));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/0");
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/64");
+        assertThat(ipPrefix.toString(), is("ffff:ffff:ffff:ffff::/64"));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
+        assertThat(ipPrefix.toString(),
+                   is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
+    }
+
+    /**
+     * Tests invalid valueOf() converter for a null string.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testInvalidValueOfNullString() {
+        Ip6Prefix ipPrefix;
+        String fromString;
+
+        fromString = null;
+        ipPrefix = Ip6Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an empty string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfEmptyString() {
+        Ip6Prefix ipPrefix;
+        String fromString;
+
+        fromString = "";
+        ipPrefix = Ip6Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for an incorrect string.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfIncorrectString() {
+        Ip6Prefix ipPrefix;
+        String fromString;
+
+        fromString = "NoSuchIpPrefix";
+        ipPrefix = Ip6Prefix.valueOf(fromString);
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv6 string and
+     * negative prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfStringNegativePrefixLengthIPv6() {
+        Ip6Prefix ipPrefix;
+
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8888/-1");
+    }
+
+    /**
+     * Tests invalid valueOf() converter for IPv6 string and
+     * too long prefix length.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidValueOfStringTooLongPrefixLengthIPv6() {
+        Ip6Prefix ipPrefix;
+
+        ipPrefix =
+            Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8888/129");
+    }
+
+    /**
+     * Tests IP prefix contains another IP prefix for IPv6.
+     */
+    @Test
+    public void testContainsIpPrefixIPv6() {
+        Ip6Prefix ipPrefix;
+
+        ipPrefix = Ip6Prefix.valueOf("1111:2222:3333:4444::/120");
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::1/128")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/120")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/64")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/0")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")));
+
+        ipPrefix = Ip6Prefix.valueOf("1111:2222:3333:4444::/128");
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::1/128")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/120")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/64")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/0")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")));
+
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::1/128")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/120")));
+        assertTrue(ipPrefix.contains(Ip6Prefix.valueOf("::/64")));
+        assertTrue(ipPrefix.contains(Ip6Prefix.valueOf("::/0")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::1/128")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64")));
+        assertFalse(ipPrefix.contains(
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/120")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/64")));
+        assertFalse(ipPrefix.contains(Ip6Prefix.valueOf("::/0")));
+        assertTrue(ipPrefix.contains(
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")));
+    }
+
+    /**
+     * Tests IP prefix contains IP address for IPv6.
+     */
+    @Test
+    public void testContainsIpAddressIPv6() {
+        Ip6Prefix ipPrefix;
+
+        ipPrefix = Ip6Prefix.valueOf("1111:2222:3333:4444::/120");
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::")));
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::1")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4445::")));
+        assertFalse(ipPrefix.contains(Ip6Address.valueOf("::")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+
+        ipPrefix = Ip6Prefix.valueOf("1111:2222:3333:4444::/128");
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::1")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4445::")));
+        assertFalse(ipPrefix.contains(Ip6Address.valueOf("::")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::")));
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::1")));
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4445::")));
+        assertTrue(ipPrefix.contains(Ip6Address.valueOf("::")));
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+
+        ipPrefix =
+            Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4444::1")));
+        assertFalse(ipPrefix.contains(
+                Ip6Address.valueOf("1111:2222:3333:4445::")));
+        assertFalse(ipPrefix.contains(Ip6Address.valueOf("::")));
+        assertTrue(ipPrefix.contains(
+                Ip6Address.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+    }
+
+    /**
+     * Tests equality of {@link Ip6Prefix} for IPv6.
+     */
+    @Test
+    public void testEqualityIPv6() {
+        new EqualsTester()
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120"),
+                Ip6Prefix.valueOf("1111:2222:3333:4444::1/120"),
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/120"))
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64"),
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/64"))
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128"),
+                Ip6Prefix.valueOf("1111:2222:3333:4444::/128"))
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/64"),
+                Ip6Prefix.valueOf("1111:2222:3333:4445::/64"))
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("::/0"),
+                Ip6Prefix.valueOf("::/0"))
+            .addEqualityGroup(
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"),
+                Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"))
+            .testEquals();
+    }
+
+    /**
+     * Tests object string representation for IPv6.
+     */
+    @Test
+    public void testToStringIPv6() {
+        Ip6Prefix ipPrefix;
+
+        ipPrefix = Ip6Prefix.valueOf("1100::/8");
+        assertThat(ipPrefix.toString(), is("1100::/8"));
+
+        ipPrefix = Ip6Prefix.valueOf("1111:2222:3333:4444:5555:6666:7777:8885/8");
+        assertThat(ipPrefix.toString(), is("1100::/8"));
+
+        ipPrefix = Ip6Prefix.valueOf("::/0");
+        assertThat(ipPrefix.toString(), is("::/0"));
+
+        ipPrefix = Ip6Prefix.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128");
+        assertThat(ipPrefix.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128"));
     }
 }
diff --git a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
index 0176a8c..abc1cc5 100644
--- a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
@@ -17,6 +17,7 @@
 
 import com.google.common.net.InetAddresses;
 import com.google.common.testing.EqualsTester;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import java.net.InetAddress;
@@ -33,6 +34,7 @@
     /**
      * Tests the immutability of {@link IpAddress}.
      */
+    @Ignore("The class is not pure immutable, because it is not 'final'")
     @Test
     public void testImmutable() {
         assertThatClassIsImmutable(IpAddress.class);
@@ -80,19 +82,20 @@
     @Test
     public void testAddressToOctetsIPv4() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {1, 2, 3, 4};
+        value = new byte[] {1, 2, 3, 4};
         ipAddress = IpAddress.valueOf("1.2.3.4");
-        assertThat(ipAddress.toOctets(), is(value1));
+        assertThat(ipAddress.toOctets(), is(value));
 
-        final byte[] value2 = new byte[] {0, 0, 0, 0};
+        value = new byte[] {0, 0, 0, 0};
         ipAddress = IpAddress.valueOf("0.0.0.0");
-        assertThat(ipAddress.toOctets(), is(value2));
+        assertThat(ipAddress.toOctets(), is(value));
 
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
         ipAddress = IpAddress.valueOf("255.255.255.255");
-        assertThat(ipAddress.toOctets(), is(value3));
+        assertThat(ipAddress.toOctets(), is(value));
     }
 
     /**
@@ -101,38 +104,39 @@
     @Test
     public void testAddressToOctetsIPv6() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88};
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88};
         ipAddress =
             IpAddress.valueOf("1111:2222:3333:4444:5555:6666:7777:8888");
-        assertThat(ipAddress.toOctets(), is(value1));
+        assertThat(ipAddress.toOctets(), is(value));
 
-        final byte[] value2 = new byte[] {0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00};
+        value = new byte[] {0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00};
         ipAddress = IpAddress.valueOf("::");
-        assertThat(ipAddress.toOctets(), is(value2));
+        assertThat(ipAddress.toOctets(), is(value));
 
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
         ipAddress =
             IpAddress.valueOf("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
-        assertThat(ipAddress.toOctets(), is(value3));
+        assertThat(ipAddress.toOctets(), is(value));
     }
 
     /**
-     * Tests returning an IPv4 address asn an integer.
+     * Tests returning an IPv4 address as an integer.
      */
     @Test
     public void testToInt() {
@@ -171,18 +175,19 @@
     @Test
     public void testValueOfByteArrayIPv4() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {1, 2, 3, 4};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value1);
+        value = new byte[] {1, 2, 3, 4};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value);
         assertThat(ipAddress.toString(), is("1.2.3.4"));
 
-        final byte[] value2 = new byte[] {0, 0, 0, 0};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value2);
+        value = new byte[] {0, 0, 0, 0};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value);
         assertThat(ipAddress.toString(), is("0.0.0.0"));
 
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value3);
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value);
         assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
@@ -192,32 +197,33 @@
     @Test
     public void testValueOfByteArrayIPv6() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value1);
+        value = new byte[] {0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value);
         assertThat(ipAddress.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        final byte[] value2 = new byte[] {0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value2);
+        value = new byte[] {0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value);
         assertThat(ipAddress.toString(), is("::"));
 
-        final byte[] value3 = new byte[] {(byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff};
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value3);
+        value = new byte[] {(byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff};
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value);
         assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
@@ -274,24 +280,25 @@
     @Test
     public void testValueOfByteArrayOffsetIPv4() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {11, 22, 33,   // Preamble
-                                          1, 2, 3, 4,
-                                          44, 55};      // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value1, 3);
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            1, 2, 3, 4,
+                            44, 55};                    // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value, 3);
         assertThat(ipAddress.toString(), is("1.2.3.4"));
 
-        final byte[] value2 = new byte[] {11, 22,       // Preamble
-                                          0, 0, 0, 0,
-                                          33};          // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value2, 2);
+        value = new byte[] {11, 22,                     // Preamble
+                            0, 0, 0, 0,
+                            33};                        // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value, 2);
         assertThat(ipAddress.toString(), is("0.0.0.0"));
 
-        final byte[] value3 = new byte[] {11, 22,       // Preamble
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          33};          // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value3, 2);
+        value = new byte[] {11, 22,                     // Preamble
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            33};                        // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value, 2);
         assertThat(ipAddress.toString(), is("255.255.255.255"));
     }
 
@@ -301,38 +308,39 @@
     @Test
     public void testValueOfByteArrayOffsetIPv6() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {11, 22, 33,           // Preamble
-                                          0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88,
-                                          44, 55};              // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value1, 3);
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88,
+                            44, 55};                    // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value, 3);
         assertThat(ipAddress.toString(),
                    is("1111:2222:3333:4444:5555:6666:7777:8888"));
 
-        final byte[] value2 = new byte[] {11, 22,               // Preamble
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          0x00, 0x00, 0x00, 0x00,
-                                          33};                  // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value2, 2);
+        value = new byte[] {11, 22,                     // Preamble
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            0x00, 0x00, 0x00, 0x00,
+                            33};                        // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value, 2);
         assertThat(ipAddress.toString(), is("::"));
 
-        final byte[] value3 = new byte[] {11, 22,               // Preamble
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          (byte) 0xff, (byte) 0xff,
-                                          33};                  // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value3, 2);
+        value = new byte[] {11, 22,                     // Preamble
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            (byte) 0xff, (byte) 0xff,
+                            33};                        // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value, 2);
         assertThat(ipAddress.toString(),
                    is("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
     }
@@ -344,11 +352,12 @@
     @Test(expected = IllegalArgumentException.class)
     public void testInvalidValueOfArrayInvalidOffsetIPv4() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {11, 22, 33,   // Preamble
-                                          1, 2, 3, 4,
-                                          44, 55};      // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value1, 6);
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            1, 2, 3, 4,
+                            44, 55};                    // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET, value, 6);
     }
 
     /**
@@ -358,15 +367,16 @@
     @Test(expected = IllegalArgumentException.class)
     public void testInvalidValueOfArrayInvalidOffsetIPv6() {
         IpAddress ipAddress;
+        byte[] value;
 
-        final byte[] value1 = new byte[] {11, 22, 33,           // Preamble
-                                          0x11, 0x11, 0x22, 0x22,
-                                          0x33, 0x33, 0x44, 0x44,
-                                          0x55, 0x55, 0x66, 0x66,
-                                          0x77, 0x77,
-                                          (byte) 0x88, (byte) 0x88,
-                                          44, 55};              // Extra bytes
-        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value1, 6);
+        value = new byte[] {11, 22, 33,                 // Preamble
+                            0x11, 0x11, 0x22, 0x22,
+                            0x33, 0x33, 0x44, 0x44,
+                            0x55, 0x55, 0x66, 0x66,
+                            0x77, 0x77,
+                            (byte) 0x88, (byte) 0x88,
+                            44, 55};                    // Extra bytes
+        ipAddress = IpAddress.valueOf(IpAddress.Version.INET6, value, 6);
     }
 
     /**
diff --git a/utils/misc/src/test/java/org/onlab/packet/IpPrefixTest.java b/utils/misc/src/test/java/org/onlab/packet/IpPrefixTest.java
index e12867b..c2171ce 100644
--- a/utils/misc/src/test/java/org/onlab/packet/IpPrefixTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/IpPrefixTest.java
@@ -16,6 +16,7 @@
 package org.onlab.packet;
 
 import com.google.common.testing.EqualsTester;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import static org.hamcrest.Matchers.equalTo;
@@ -32,6 +33,7 @@
     /**
      * Tests the immutability of {@link IpPrefix}.
      */
+    @Ignore("The class is not pure immutable, because it is not 'final'")
     @Test
     public void testImmutable() {
         assertThatClassIsImmutable(IpPrefix.class);