diff --git a/dubbo-registry-multicast/src/main/java/com/alibaba/dubbo/registry/multicast/MulticastRegistry.java b/dubbo-registry-multicast/src/main/java/com/alibaba/dubbo/registry/multicast/MulticastRegistry.java
index 66ca22ef9c9df35811cdd751fea7797e68dc720d..c477387254a278bb5ebe13d950087940388bcf15 100644
--- a/dubbo-registry-multicast/src/main/java/com/alibaba/dubbo/registry/multicast/MulticastRegistry.java
+++ b/dubbo-registry-multicast/src/main/java/com/alibaba/dubbo/registry/multicast/MulticastRegistry.java
@@ -159,7 +159,7 @@ public class MulticastRegistry extends AbstractRegistry {
     
     private void unicast(String msg, URL url) {
         if (logger.isInfoEnabled()) {
-            logger.info("Send unicast message: " + msg + " to " + url.getAddress());
+            logger.info("Send unicast message: " + msg + " to " + url.getAddress() + ":" + mutilcastSocket.getLocalPort());
         }
         try {
             byte[] data = (msg + "\n").getBytes();