Report By Name : NetworkInterface « Network « Java Tutorial

import java.net.NetworkInterface;

public class Main {
  static public void main(String args[]) throws Exception {
    NetworkInterface ni = NetworkInterface.getByName(args[0]);
    System.out.println(ni);
  }
}

19.8.NetworkInterface
	19.8.1.	Interface Lister
	19.8.2.	Programmatic Access to Network Parameters
	19.8.3.	An updated version of the ListNets program that uses the NetworkInterface enhancements
	19.8.4.	Get MAC address of a host: java.net.NetworkInterface.getHardwareAddress().
	19.8.5.	Report By Name
	19.8.6.	Enumeration of NetworkInterface
	19.8.7.	Report By Address
	19.8.8.	NetworkInterface