diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
index 256a98e..29c4377 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
@@ -1,7 +1,5 @@
 package net.onrc.onos.ofcontroller.core;
 
-import net.onrc.onos.ofcontroller.flowmanager.web.DatapathSummarySerializer;
-
 import org.codehaus.jackson.annotate.JsonIgnore;
 import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
@@ -13,6 +11,9 @@
 import com.tinkerpop.frames.annotations.gremlin.GremlinParam;
 import com.tinkerpop.frames.VertexFrame;
 
+import net.onrc.onos.ofcontroller.flowmanager.web.DatapathSummarySerializer;
+import net.floodlightcontroller.core.web.serializers.IPv4Serializer;
+
 /*
  * This is the interfaces to make the objects for Cassandra DB.
  * They are interfaces, but it is also implementation,
@@ -205,6 +206,7 @@
 		
 		@JsonProperty("ipv4")
 		@Property("ipv4_address")
+		@JsonSerialize(using=IPv4Serializer.class)
 		public int getIpv4Address();
 		
 		@Property("ipv4_address")