Get root domain from request

Question

Consider the below URL as an example. http://www.test1.example.com

Is there any method by which I can get \"example.com\" as an output. I know there is

Answer 1

import java.net.InetAddress;

void Func() {
    InetAddress ia = InetAddress.getLocalHost();
    System.out.println (ia.getHostName());
}

Hope this helps.