Java IP Address Validate isIPv4AddressValid(String cidr)

Description

Checks if the passed IP v4 address in string form is valid The address may specify a mask at the end as "/MM"

License

Open Source License

Parameter

Parameter	Description
cidr	the v4 address as A.B.C.D/MM

Declaration

public static boolean isIPv4AddressValid(String cidr) 

Method Source Code

//package com.java2s;
/*//from  www. j a va  2  s . com
 * Copyright (c) 2013-2014 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**
     * Checks if the passed IP v4 address in string form is valid The address
     * may specify a mask at the end as "/MM"
     *
     * @param cidr the v4 address as A.B.C.D/MM
     * @return
     */
    public static boolean isIPv4AddressValid(String cidr) {
        if (cidr == null) {
            return false;
        }

        String values[] = cidr.split("/");
        Pattern ipv4Pattern = Pattern
                .compile("(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])");
        Matcher mm = ipv4Pattern.matcher(values[0]);
        if (!mm.matches()) {
            return false;
        }
        if (values.length >= 2) {
            int prefix = Integer.valueOf(values[1]);
            if ((prefix < 0) || (prefix > 32)) {
                return false;
            }
        }
        return true;
    }
}

Related

1. isIpv4(String ipv4)
2. isIpV4Address(CharSequence address)
3. isIPv4Address(final String input)
4. isIPv4Address(final String input)
5. isIPv4Address(String ipAddress)
6. isIpv4Correct(String ipAddress)
7. isIPv4Format(String ip)
8. isIPv4Format(String str)
9. isIPv4LiteralAddress(String src)