diff --git a/src/main/java/net/onrc/onos/core/topology/HostData.java b/src/main/java/net/onrc/onos/core/topology/HostData.java
index e790134..33f3803 100644
--- a/src/main/java/net/onrc/onos/core/topology/HostData.java
+++ b/src/main/java/net/onrc/onos/core/topology/HostData.java
@@ -41,6 +41,17 @@
      *
      * @param mac the MAC address to identify the host
      */
+    public HostData(MACAddress mac) {
+        this.mac = checkNotNull(mac);
+        this.ip = 0;
+        this.attachmentPoints = new LinkedList<>();
+    }
+
+    /**
+     * Constructor for a given host MAC address.
+     *
+     * @param mac the MAC address to identify the host
+     */
     public HostData(MACAddress mac, int ip) {
         this.mac = checkNotNull(mac);
         this.ip = ip;
diff --git a/src/test/java/net/onrc/onos/core/hostmanager/HostManagerTest.java b/src/test/java/net/onrc/onos/core/hostmanager/HostManagerTest.java
index 26ceb59..8461334 100644
--- a/src/test/java/net/onrc/onos/core/hostmanager/HostManagerTest.java
+++ b/src/test/java/net/onrc/onos/core/hostmanager/HostManagerTest.java
@@ -242,6 +242,7 @@
         byte[] address = new byte[] {0x00, 0x44, 0x33, 0x22, 0x11, 0x01};
         MACAddress srcMac = new MACAddress(address);
         Host host1 = new Host(srcMac,
+                0,
                 null,
                 sw1Dpid,
                 sw1DevPort,
diff --git a/src/test/java/net/onrc/onos/core/hostmanager/HostTest.java b/src/test/java/net/onrc/onos/core/hostmanager/HostTest.java
index b9eed02..90f66e9 100644
--- a/src/test/java/net/onrc/onos/core/hostmanager/HostTest.java
+++ b/src/test/java/net/onrc/onos/core/hostmanager/HostTest.java
@@ -45,8 +45,8 @@
      */
     @Test
     public void testHashCode() {
-        Host host1 = new Host(mac1, null, dpid1, portNum1, date1);
-        Host host2 = new Host(mac2, null, dpid2, portNum2, date2);
+        Host host1 = new Host(mac1, 0, null, dpid1, portNum1, date1);
+        Host host2 = new Host(mac2, 0, null, dpid2, portNum2, date2);
 
         assertTrue(host1.hashCode() == host2.hashCode());
     }
@@ -56,8 +56,8 @@
      */
     @Test
     public void testEqualsObject() {
-        Host host1 = new Host(mac1, null, dpid1, portNum1, date1);
-        Host host2 = new Host(mac2, null, dpid2, portNum2, date2);
+        Host host1 = new Host(mac1, 0, null, dpid1, portNum1, date1);
+        Host host2 = new Host(mac2, 0, null, dpid2, portNum2, date2);
 
         assertTrue(host1.equals(host2));
     }