Here you can find the source of getIpAddress()
public static byte[] getIpAddress()
//package com.java2s; /**//w w w. jav a 2s . co m * Useful InetAddress Utilities * * @author Kenneth Partlow * <br> * Copyright (c) Cedar Software LLC * <br><br> * 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 * <br><br> * http://www.apache.org/licenses/LICENSE-2.0 * <br><br> * 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.UnknownHostException; public class Main { public static byte[] getIpAddress() { try { return getLocalHost().getAddress(); } catch (Exception e) { // LOG.warn("Failed to obtain computer's IP address", e); return new byte[] { 0, 0, 0, 0 }; } } public static InetAddress getLocalHost() throws UnknownHostException { return InetAddress.getLocalHost(); } }