Here you can find the source of ipToByte(String ip)
public static byte[] ipToByte(String ip)
//package com.java2s; /* Avuna HTTPD - General Server Applications Copyright (C) 2015 Maxwell Bruce/*from ww w. j av a 2 s . com*/ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.*/ public class Main { public static byte[] ipToByte(String ip) { String[] spl1 = ip.split("\\."); byte[] spl2 = new byte[spl1.length]; for (int i = 0; i < spl1.length; i++) { spl2[i] = (byte) Integer.parseInt(spl1[i]); } return spl2; } }