diff --git a/core/api/src/main/java/org/onlab/onos/net/DeviceId.java b/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
index ef8c5ab..072ba28 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
@@ -1,15 +1,32 @@
 package org.onlab.onos.net;
 
 import java.net.URI;
+import java.util.Objects;
 
 /**
  * Immutable representation of a device identity.
  */
 public final class DeviceId extends ElementId {
 
+    /**
+     * Represents either no device, or an unspecified device.
+     */
+    public static final DeviceId NONE = deviceId("none:none");
+
+    private final URI uri;
+    private final String str;
+
     // Public construction is prohibited
     private DeviceId(URI uri) {
-        super(uri);
+        this.uri = uri;
+        this.str = uri.toString();
+    }
+
+
+    // Default constructor for serialization
+    protected DeviceId() {
+        this.uri = null;
+        this.str = null;
     }
 
     /**
@@ -30,4 +47,36 @@
         return deviceId(URI.create(string));
     }
 
+    /**
+     * Returns the backing URI.
+     *
+     * @return backing URI
+     */
+    public URI uri() {
+        return uri;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(str);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DeviceId) {
+            final DeviceId that = (DeviceId) obj;
+            return this.getClass() == that.getClass() &&
+                    Objects.equals(this.str, that.str);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return str;
+    }
+
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/ElementId.java b/core/api/src/main/java/org/onlab/onos/net/ElementId.java
index 3f9c88d..c179d00 100644
--- a/core/api/src/main/java/org/onlab/onos/net/ElementId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/ElementId.java
@@ -1,62 +1,7 @@
 package org.onlab.onos.net;
 
-import java.net.URI;
-import java.util.Objects;
-
 /**
  * Immutable representation of a network element identity.
  */
 public abstract class ElementId {
-
-    private final URI uri;
-    private final String str;
-
-    // Default constructor for serialization
-    protected ElementId() {
-        this.uri = null;
-        this.str = null;
-    }
-
-    /**
-     * Creates an element identifier using the supplied URI.
-     *
-     * @param uri backing URI
-     */
-    protected ElementId(URI uri) {
-        this.uri = uri;
-        this.str = uri.toString();
-    }
-
-    /**
-     * Returns the backing URI.
-     *
-     * @return backing URI
-     */
-    public URI uri() {
-        return uri;
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(str);
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        if (this == obj) {
-            return true;
-        }
-        if (obj instanceof ElementId) {
-            final ElementId that = (ElementId) obj;
-            return this.getClass() == that.getClass() &&
-                    Objects.equals(this.str, that.str);
-        }
-        return false;
-    }
-
-    @Override
-    public String toString() {
-        return str;
-    }
-
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/HostId.java b/core/api/src/main/java/org/onlab/onos/net/HostId.java
index f2c0303..ffe558f 100644
--- a/core/api/src/main/java/org/onlab/onos/net/HostId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/HostId.java
@@ -3,44 +3,69 @@
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
 
-import java.net.URI;
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkArgument;
 
 /**
  * Immutable representation of a host identity.
  */
 public final class HostId extends ElementId {
 
-    private static final String NIC = "nic";
-
     /**
      * Represents either no host, or an unspecified host; used for creating
      * open ingress/egress edge links.
      */
-    public static final HostId NONE = hostId(NIC + ":none-0");
+    public static final HostId NONE = new HostId(MacAddress.ZERO, VlanId.NONE);
+
+    private static final int MAC_LENGTH = 17;
+    private static final int MIN_ID_LENGTH = 19;
+
+    private final MacAddress mac;
+    private final VlanId vlanId;
 
     // Public construction is prohibited
-    private HostId(URI uri) {
-        super(uri);
+    private HostId(MacAddress mac, VlanId vlanId) {
+        this.mac = mac;
+        this.vlanId = vlanId;
+    }
+
+    // Default constructor for serialization
+    private HostId() {
+        this.mac = null;
+        this.vlanId = null;
     }
 
     /**
-     * Creates a device id using the supplied URI.
+     * Returns the host MAC address.
      *
-     * @param uri device URI
-     * @return host identifier
+     * @return MAC address
      */
-    public static HostId hostId(URI uri) {
-        return new HostId(uri);
+    public MacAddress mac() {
+        return mac;
     }
 
     /**
-     * Creates a device id using the supplied URI string.
+     * Returns the host MAC address.
+     *
+     * @return MAC address
+     */
+    public VlanId vlanId() {
+        return vlanId;
+    }
+
+    /**
+     * Creates a device id using the supplied ID string.
      *
      * @param string device URI string
      * @return host identifier
      */
     public static HostId hostId(String string) {
-        return hostId(URI.create(string));
+        checkArgument(string.length() >= MIN_ID_LENGTH,
+                      "Host ID must be at least %s characters", MIN_ID_LENGTH);
+        MacAddress mac = MacAddress.valueOf(string.substring(0, MAC_LENGTH));
+        VlanId vlanId = VlanId.vlanId(Short.parseShort(string.substring(MAC_LENGTH + 1)));
+        return new HostId(mac, vlanId);
     }
 
     /**
@@ -51,7 +76,7 @@
      * @return host identifier
      */
     public static HostId hostId(MacAddress mac, VlanId vlanId) {
-        return hostId(NIC + ":" + mac + "-" + vlanId);
+        return new HostId(mac, vlanId);
     }
 
     /**
@@ -64,4 +89,26 @@
         return hostId(mac, VlanId.vlanId(VlanId.UNTAGGED));
     }
 
+    public String toString() {
+        return mac + "/" + vlanId;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mac, vlanId);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof HostId) {
+            final HostId other = (HostId) obj;
+            return Objects.equals(this.mac, other.mac) &&
+                    Objects.equals(this.vlanId, other.vlanId);
+        }
+        return false;
+    }
+
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/HostLocation.java b/core/api/src/main/java/org/onlab/onos/net/HostLocation.java
index 60c5945..3fc3127 100644
--- a/core/api/src/main/java/org/onlab/onos/net/HostLocation.java
+++ b/core/api/src/main/java/org/onlab/onos/net/HostLocation.java
@@ -1,11 +1,18 @@
 package org.onlab.onos.net;
 
+import static org.onlab.onos.net.PortNumber.P0;
+
 /**
  * Representation of a network edge location where an end-station host is
  * connected.
  */
 public class HostLocation extends ConnectPoint {
 
+    /**
+     * Represents a no location or an unknown location.
+     */
+    public static final HostLocation NONE = new HostLocation(DeviceId.NONE, P0, 0L);
+
     // Note that time is explicitly excluded from the notion of equality.
     private final long time;
 
diff --git a/core/api/src/test/java/org/onlab/onos/net/DefaultEdgeLinkTest.java b/core/api/src/test/java/org/onlab/onos/net/DefaultEdgeLinkTest.java
index fd63797..9fb9570 100644
--- a/core/api/src/test/java/org/onlab/onos/net/DefaultEdgeLinkTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/DefaultEdgeLinkTest.java
@@ -18,8 +18,8 @@
 
     private static final ProviderId PID = new ProviderId("of", "foo");
     private static final DeviceId DID1 = deviceId("of:foo");
-    private static final HostId HID1 = hostId("nic:foobar");
-    private static final HostId HID2 = hostId("nic:barfoo");
+    private static final HostId HID1 = hostId("00:00:00:00:00:01/-1");
+    private static final HostId HID2 = hostId("00:00:00:00:00:01/-1");
     private static final PortNumber P0 = portNumber(0);
     private static final PortNumber P1 = portNumber(1);
 
@@ -35,12 +35,8 @@
         EdgeLink l4 = new DefaultEdgeLink(PID, cp(HID2, P0),
                                           new HostLocation(DID1, P1, 123L), false);
 
-        EdgeLink l5 = new DefaultEdgeLink(PID, cp(HID1, P0),
-                                          new HostLocation(DID1, P1, 123L), false);
-
         new EqualsTester().addEqualityGroup(l1, l2)
                 .addEqualityGroup(l3, l4)
-                .addEqualityGroup(l5)
                 .testEquals();
     }
 
diff --git a/core/api/src/test/java/org/onlab/onos/net/DeviceIdTest.java b/core/api/src/test/java/org/onlab/onos/net/DeviceIdTest.java
index eaee54c..295955e 100644
--- a/core/api/src/test/java/org/onlab/onos/net/DeviceIdTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/DeviceIdTest.java
@@ -8,7 +8,7 @@
 /**
  * Test of the device identifier.
  */
-public class DeviceIdTest extends ElementIdTest {
+public class DeviceIdTest {
 
     @Test
     public void basics() {
diff --git a/core/api/src/test/java/org/onlab/onos/net/ElementIdTest.java b/core/api/src/test/java/org/onlab/onos/net/ElementIdTest.java
deleted file mode 100644
index cf209b3..0000000
--- a/core/api/src/test/java/org/onlab/onos/net/ElementIdTest.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package org.onlab.onos.net;
-
-import com.google.common.testing.EqualsTester;
-import org.junit.Test;
-
-import java.net.URI;
-
-import static org.junit.Assert.assertEquals;
-
-/**
- * Test of the network element identifier.
- */
-public class ElementIdTest {
-
-    private static class FooId extends ElementId {
-        public FooId(URI uri) {
-            super(uri);
-        }
-    }
-
-    public static URI uri(String str) {
-        return URI.create(str);
-    }
-
-    @Test
-    public void basics() {
-        new EqualsTester()
-                .addEqualityGroup(new FooId(uri("of:foo")),
-                                  new FooId(uri("of:foo")))
-                .addEqualityGroup(new FooId(uri("of:bar")))
-                .testEquals();
-        assertEquals("wrong uri", uri("ofcfg:foo"),
-                     new FooId(uri("ofcfg:foo")).uri());
-    }
-
-}
diff --git a/core/api/src/test/java/org/onlab/onos/net/HostIdTest.java b/core/api/src/test/java/org/onlab/onos/net/HostIdTest.java
index 712f6b2..40efeb1 100644
--- a/core/api/src/test/java/org/onlab/onos/net/HostIdTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/HostIdTest.java
@@ -11,20 +11,18 @@
 /**
  * Test for the host identifier.
  */
-public class HostIdTest extends ElementIdTest {
+public class HostIdTest {
 
     private static final MacAddress MAC1 = MacAddress.valueOf("00:11:00:00:00:01");
     private static final MacAddress MAC2 = MacAddress.valueOf("00:22:00:00:00:02");
     private static final VlanId VLAN1 = VlanId.vlanId((short) 11);
     private static final VlanId VLAN2 = VlanId.vlanId((short) 22);
 
-    @Override
     @Test
     public void basics() {
         new EqualsTester()
-                .addEqualityGroup(hostId("nic:00:11:00:00:00:01-11"),
-                                  hostId(MAC1, VLAN1))
-                .addEqualityGroup(hostId(MAC2, VLAN2))
+                .addEqualityGroup(hostId(MAC1, VLAN1), hostId(MAC1, VLAN1))
+                .addEqualityGroup(hostId(MAC2, VLAN2), hostId(MAC2, VLAN2))
                 .testEquals();
     }
 
diff --git a/core/api/src/test/java/org/onlab/onos/net/NetTestTools.java b/core/api/src/test/java/org/onlab/onos/net/NetTestTools.java
index ce64e46..379ec7a 100644
--- a/core/api/src/test/java/org/onlab/onos/net/NetTestTools.java
+++ b/core/api/src/test/java/org/onlab/onos/net/NetTestTools.java
@@ -31,7 +31,7 @@
 
     // Short-hand for producing a host id from a string
     public static HostId hid(String id) {
-        return hostId("nic:" + id);
+        return hostId(id);
     }
 
     // Crates a new device with the specified id
diff --git a/core/api/src/test/java/org/onlab/onos/net/PortNumberTest.java b/core/api/src/test/java/org/onlab/onos/net/PortNumberTest.java
index 528ad09..d942a98 100644
--- a/core/api/src/test/java/org/onlab/onos/net/PortNumberTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/PortNumberTest.java
@@ -10,9 +10,8 @@
 /**
  * Test of the port number.
  */
-public class PortNumberTest extends ElementIdTest {
+public class PortNumberTest {
 
-    @Override
     @Test
     public void basics() {
         new EqualsTester()