Looking for Port: 1024 -- 65536

       

import java.net.*;
import java.io.*;

public class lookForPorts2 {

  public static void main(String[] args) {

    Socket theSocket;
    String host = "localhost";

    if (args.length > 0) {
      host = args[0];
    }

    try {
      InetAddress theAddress = InetAddress.getByName(host);
      for (int i = 1024; i < 65536; i++) {
        try {
          System.out.println("Looking for port "+ i);
          theSocket = new Socket(theAddress, i);
          System.out.println("There is a server on port " + i + " of " + host);
        } catch (IOException e) {
          // must not be a server on this port
        }
      }
    } catch (UnknownHostException e) {
      System.err.println(e);
    }
  }
}

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Looking for Port: 1024 -- 65536 : IP Address « Network Protocol « Java

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