Question

I am working on code where I need to find whether the ipAddress belongs to Private Range or not. Any suggestions will be appreciated.

UPDATED-

This is my method-

    if(isPrivateIPAddress(ipAddress)) {

     //do whatever you want

}



private static boolean isPrivateIPAddress(InetAddress address, String range) {
    // TODO Auto-generated method stub
    String ipAddress = address.getHostAddress();
    return ipAddress.startsWith( range );
}

So I am not sure what is the address we need to pass in the above if loop.

Answer 1

Take a look at this method, you can determine if an IP address starts with the defined private range:

public static boolean isInPrivateRange(InetAddress address, String range)
{
    String ipAddress = address.getHostAddress();
    return ipAddress.startsWith( range );
}

Sample invocations:

isInPrivateRange( address, "192.168." );
isInPrivateRange( address, "172.16." );
isInPrivateRange( address, "127.0." );

Sample program:

try
{
    InetAddress ipAddress = InetAddress.getByName( "google.com" );
    String range = "192.168";           
    System.out.println(isInPrivateRange( ipAddress, range ));
}
catch ( UnknownHostException e )
{
    e.printStackTrace();
}