Here you can find the source of isValidInetAddress(String ip)
public static void isValidInetAddress(String ip) throws IllegalArgumentException
//package com.java2s; /*//from www .jav a 2s.com * Copyright 2015 VMware, Inc. All Rights Reserved. * * 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.InetAddress; import java.net.UnknownHostException; public class Main { public static void isValidInetAddress(String ip) throws IllegalArgumentException { if (ip != null && !ip.isEmpty()) { if (!ip.contains(":")) { String[] segments = ip.split("\\."); if (segments.length != 4) { throw new IllegalArgumentException("IP does not appear valid:" + ip); } try { InetAddress.getByName(ip); } catch (UnknownHostException var3) { throw new IllegalArgumentException(var3); } } } else { throw new IllegalArgumentException("IP is missing or empty"); } } }