Here you can find the source of getLanIPAddress()
public static String getLanIPAddress() throws SocketException
//package com.java2s; /*/*from ww w .j a v a 2s. com*/ Copyright 2014 Marius Lindvall Licensed 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.Inet4Address; import java.net.InetAddress; import java.net.InterfaceAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.Enumeration; public class Main { public static String getLanIPAddress() throws SocketException { for (final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); interfaces .hasMoreElements();) { final NetworkInterface cur = interfaces.nextElement(); if (cur.isLoopback()) { continue; } for (final InterfaceAddress addr : cur.getInterfaceAddresses()) { final InetAddress inet_addr = addr.getAddress(); if (!(inet_addr instanceof Inet4Address)) { continue; } return inet_addr.getHostAddress(); } } return null; } }