import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class lookForPorts3 {
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 = 1; i <= 65535; i++) {
try {
theSocket = new Socket(host, i);
System.out.println("There is a server on port " + i + " of " + host);
theSocket.close();
} catch (IOException e) {
// must not be a server on this port
}
}
} catch (UnknownHostException e) {
System.err.println(e);
}
}
}