public   class  mclookup {
     public   static   void  main(String args[])  throws  IOException {
        String s = "test";
        DatagramSocket ds=  new  DatagramSocket( null );
        ds.setBroadcast(true);
        // bc = 10.10.255.255
        ds.bind( new  InetSocketAddress(InetAddress.getByName("bc"), 18888 ));
        ....

java.net.BindException: Cannot assign requested address: Cannot bind
	at java.net.PlainDatagramSocketImpl.bind( Native  Method)
	at java.net.DatagramSocket.bind(DatagramSocket.java: 331 )
	at mclookup.main(mclookup.java: 14 )