Utility routine to check if the InetAddress is an IPv4 mapped IPv6 address. - Java Network

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Description

Utility routine to check if the InetAddress is an IPv4 mapped IPv6 address.

Demo Code

/*/*from www  . j a  v a2 s.co  m*/
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code 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
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//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] addr = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(isIPv4MappedAddress(addr));
    }

    private static final int INADDR16SZ = 16;

    /**
     * Utility routine to check if the InetAddress is an
     * IPv4 mapped IPv6 address.
     *
     * @return a <code>boolean</code> indicating if the InetAddress is
     * an IPv4 mapped IPv6 address; or false if address is IPv4 address.
     */
    private static boolean isIPv4MappedAddress(byte[] addr) {
        if (addr.length < INADDR16SZ) {
            return false;
        }
        if ((addr[0] == 0x00) && (addr[1] == 0x00) && (addr[2] == 0x00)
                && (addr[3] == 0x00) && (addr[4] == 0x00)
                && (addr[5] == 0x00) && (addr[6] == 0x00)
                && (addr[7] == 0x00) && (addr[8] == 0x00)
                && (addr[9] == 0x00) && (addr[10] == (byte) 0xff)
                && (addr[11] == (byte) 0xff)) {
            return true;
        }
        return false;
    }
}

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