Here you can find the source of getOneDotPrefix(InetAddress addr)
private static String getOneDotPrefix(InetAddress addr)
//package com.java2s; /*//from w w w . ja v a 2 s . c o m * Copyright (C) 2009 Swedish Institute of Computer Science (SICS) Copyright (C) * 2009 Royal Institute of Technology (KTH) * * GVoD 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 2 * 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ import java.net.InetAddress; public class Main { private static String getOneDotPrefix(InetAddress addr) { String textualPrefixAddr = addr.getHostAddress(); int firstDot = textualPrefixAddr.indexOf("."); textualPrefixAddr = textualPrefixAddr.substring(0, firstDot); return textualPrefixAddr; } }