Allowed subnet mask IP

hi,

i have a code which is restrict publish from specified IP., if publisher is not 123.123.123.123 IP he cannot publish stream.

Now i want Subnet mask IP to allowed like 123.123.123.0/16.

application.onPublish = function(p_client, streamname){

     if (p_client.ip != "123.123.123.123"){

        application.disconnect(p_client);

    }

}