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    <p>The most appropriate way to do it, if they are in the same LAN is:</p> <ul> <li>Client sends a UDP broadcast to a specific port and matching the network class (A,B,C)</li> <li>Server is listening on this port, receives the broadcast packet and connect or send his IP to the client.</li> </ul> <p>With just two network packets you know the IP address.</p> <p>--EDITED--</p> <p>To broadcast:</p> <pre><code>InetAddress broadcastAddr = SharedFunctions.getNetworkLocalBroadcastAddressdAsInetAddress(); DatagramSocket socket = null; try { socket = new DatagramSocket(); socket.setBroadcast(true); System.arraycopy(BROADCAST_SIGNATURE, 0, buffSend, 0, BROADCAST_SIGNATURE.length); DatagramPacket packet = new DatagramPacket(buffSend, buffSend.length, broadcastAddr, BROADCAST_PORT); socket.send(packet); } catch (Exception e) { e.printStackTrace(); if(socket != null) try {socket.close();} catch (Exception e1) {} } public static InetAddress getNetworkLocalBroadcastAddressdAsInetAddress() throws IOException { for (Enumeration&lt;NetworkInterface&gt; en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) { NetworkInterface intf = en.nextElement(); if(VERSION.SDK_INT &lt; 9) { if(!intf.getInetAddresses().nextElement().isLoopbackAddress()){ byte[] quads = intf.getInetAddresses().nextElement().getAddress(); quads[0] = (byte)255; return InetAddress.getByAddress(quads); } }else{ if(!intf.isLoopback()){ List&lt;InterfaceAddress&gt; intfaddrs = intf.getInterfaceAddresses(); return intfaddrs.get(0).getBroadcast(); //return first IP address } } } return null; } </code></pre> <p>To receice broadcast:</p> <pre><code> try { socketReceiver = new DatagramSocket(BROADCAST_PORT); socketReceiver.setBroadcast(true); DatagramPacket packet = new DatagramPacket(buffRecv, buffRecv.length); while(Thread.currentThread() == cThreadReceiver){ socketReceiver.receive(packet); //here you receive the packet and can check the sender IP address } } catch (Exception e) { e.printStackTrace(); if(socketReceiver != null) try {socketReceiver.close();} catch (Exception e1) {} } </code></pre> <p>You will need to do some editing but should start you in the right track.</p>
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    1. COdo you mean UDP or UDB? Do you have any solution for this in Java / Android?
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    2. COUDP broadcast I heard it 1000 times when I was in school and now when I need it I forgot about it. Thank you 1000times...
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    3. COIt's a typo. Correct is UDP. I'll look for an example.
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