import java.net.*; import java.io.*; public class lookForLocalPorts { public static void main(String[] args) { ServerSocket theServer; for (int i = 1024; i <= 65535; i++) { try { // the next line will fail and drop into the catch block if // there is already a server running on port i theServer = new ServerSocket(i); theServer.close(); } catch (IOException e) { System.out.println("There is a server on port " + i + "."); } // end try } // end for } }