Here you can find the source of getIpAddress()
public static String getIpAddress() throws SocketException
//package com.java2s; /*/*from w ww.j a va 2s. co m*/ * Copyright (c) 2005-2014, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. licenses this file to you under the Apache License, * Version 2.0 (the "License"); you may not use this file except * in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.Enumeration; public class Main { public static String getIpAddress() throws SocketException { Enumeration e = NetworkInterface.getNetworkInterfaces(); String address = "127.0.0.1"; while (e.hasMoreElements()) { NetworkInterface netface = (NetworkInterface) e.nextElement(); Enumeration addresses = netface.getInetAddresses(); while (addresses.hasMoreElements()) { InetAddress ip = (InetAddress) addresses.nextElement(); if (!ip.isLoopbackAddress() && isIP(ip.getHostAddress())) { return ip.getHostAddress(); } } } return address; } private static boolean isIP(String hostAddress) { return hostAddress.split("[.]").length == 4; } }