Java tutorial
//package com.java2s; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.Enumeration; public class Main { public static String getIpAddress() { try { Enumeration en = NetworkInterface.getNetworkInterfaces(); while (en.hasMoreElements()) { NetworkInterface ex = (NetworkInterface) en.nextElement(); Enumeration enumIpAddr = ex.getInetAddresses(); while (enumIpAddr.hasMoreElements()) { InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } return null; } catch (SocketException var4) { var4.printStackTrace(); return null; } } }