import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;

public class NetworkUtil {

	public void printAllOwnerMacs() {
		InetAddress[] ias;
		try {
			ias = InetAddress.getAllByName(getOwnerHostName());
			if (ias != null)
				for (InetAddress ia : ias) {
					System.out.println(ia.getHostAddress());
				}
		} catch (UnknownHostException e) {
			System.err.println("Unbekannter Hostname");
		}
	}

	public String getOwnerHostName() {
		try {
			return InetAddress.getLocalHost().getHostName();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return null;
	}

	public String getOwnerNetworkDeviceName() {
		try {
			NetworkInterface ni = NetworkInterface.getByInetAddress(InetAddress
					.getLocalHost());
			if (ni != null)
				return ni.getDisplayName();
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return null;
	}

	public String getOwnerMac() {
		try {
			NetworkInterface ni = NetworkInterface.getByInetAddress(InetAddress
					.getLocalHost());
			byte[] hwa = ni.getHardwareAddress();
			if (hwa == null)
				return null;
			String mac = "";
			for (int i = 0; i < hwa.length; i++) {
				mac += String.format("%x:", hwa[i]);
			}
			if (mac.length() > 0 && !ni.isLoopback()) {
				return mac.toLowerCase().substring(0, mac.length() - 1);
			}
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return null;
	}

	public String getOwnerIp() {
		try {
			return InetAddress.getLocalHost().getHostAddress();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) {
		NetworkUtil nu = new NetworkUtil();
		nu.printAllOwnerMacs();
		System.out.println("Host-Name: " + nu.getOwnerHostName());
		System.out.println("Device-Name: " + nu.getOwnerNetworkDeviceName());
		System.out.println("Mac-Adresse: " + nu.getOwnerMac());
		System.out.println("IP: " + nu.getOwnerIp());
	}
}