Here you can find the source of getIPv4Address(NetworkInterface iface)
public static Inet4Address getIPv4Address(NetworkInterface iface)
//package com.java2s; /**//from w w w . j a v a2 s . c o m * Copyright 2016 Ambud Sharma * * 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.InterfaceAddress; import java.net.NetworkInterface; public class Main { public static Inet4Address getIPv4Address(NetworkInterface iface) { for (InterfaceAddress interfaceAddress : iface.getInterfaceAddresses()) { if (interfaceAddress.getAddress() instanceof Inet4Address) { return (Inet4Address) interfaceAddress.getAddress(); } } return null; } }