diff --git a/ws2012/P2P/uebungen/4/src/peer/Node.java b/ws2012/P2P/uebungen/4/src/peer/Node.java
index 97c2503e..758aab08 100644
--- a/ws2012/P2P/uebungen/4/src/peer/Node.java
+++ b/ws2012/P2P/uebungen/4/src/peer/Node.java
@@ -1,6 +1,9 @@
 package peer;
 
 import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.nio.ByteBuffer;
 import java.nio.channels.DatagramChannel;
@@ -83,8 +86,17 @@ public class Node {
 	private byte[] addrToByte(SocketAddress addr) {
 		// TODO Wäre cool, die IP nicht einfach als String zu schicken.
 		// Was machen mit IPV4 vs IPV6?
-		String s = addr.toString();
-		return s.getBytes();
+		InetSocketAddress a = (InetSocketAddress) addr;
+		
+		if (a.getAddress() instanceof Inet6Address) {
+			// seems to be IPv6
+		} else if (a.getAddress() instanceof Inet4Address) {
+			// seems to be IPv4
+		} else {
+			// invalid ip address
+		}
+		
+		return a.getAddress().getAddress();
 	}
 
 	/**