[Java] IP Adresse im Netzwerk erreichbar

 for(int i = 100; i < 256; i++){
 try {
 System.out.println("192.168.2." + i);

 if(InetAddress.getByName("192.168.2." + i).isReachable(6000)){
 reachableIps.add("192.168.2." + i);
 System.out.println("REACHABLE: " + "192.168.2." + i);
 }
 } catch (UnknownHostException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 } catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 }

import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public class ReceiveMainClass {

 public static void main(String args[]) {
 try {
 MulticastSocket socket = new MulticastSocket(4447);
 DatagramPacket packet;

 InetAddress group = InetAddress.getByName("230.0.0.1");
 socket.joinGroup(group);

 while (true) {
 // Auf Anfrage warten
 packet = new DatagramPacket(new byte[65536], 1024);
 socket.receive(packet);

 // Empfänger auslesen
 InetAddress address = packet.getAddress();
 int port = packet.getPort();
 int len = packet.getLength();
 byte data[] = packet.getData();

 System.out.println("Anfrage von " + address + " vom Port "
 + port + " Laenge " + len + "\n"
 + new String(data, 0, len, "UTF8"));
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public class SendMainClass{

 public static void main(String[] args) {

 try {
 MulticastSocket socket = new MulticastSocket(4446);
 String data = new String("Hallo Welt! RaidRush");
 
 byte[] buffer = data.getBytes("UTF8");

 socket.send(new DatagramPacket(buffer, buffer.length , InetAddress.getByName("230.0.0.1") , 4447));
 System.out.println("Sending a packet...");
 
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
}