You can access network parameters about a network interface beyond the 
name and IP addresses assigned to it
<p>
You can discover if a network interface is &#8220;up&#8221; (that is,
running) with the <code>isUP()</code> method. The following methods
indicate the network interface type:
<ul> <li>
<code>isLoopback()</code> indicates if the network interface is a loopback interface.
</li>
<li>
<code>isPointToPoint()</code> indicates if the interface is a point-to-point interface.
</li>
<li>
<code>isVirtual()</code> indicates if the interface is a virtual interface.
</li></ul>

<p>
The <code>supportsMulticast()</code> method indicates whether the network interface supports multicasting.
The <code>getHardwareAddress()</code> method returns the network interface's
physical hardware address, usually called MAC address, when it is available. The
<code>getMTU()</code> method returns the Maximum Transmission Unit (MTU), which is 
the largest packet size. 
<p>
The following example expands on the example in 
 by adding the additional network parameters described on this page:

import java.io.*;
import java.net.*;
import java.util.*;
import static java.lang.System.out;

public class ListNetsEx
{
    public static void main(String args[]) throws SocketException {
        Enumeration&lt;NetworkInterface&gt; nets = NetworkInterface.getNetworkInterfaces();
        for (NetworkInterface netint : Collections.list(nets))
            displayInterfaceInformation(netint);
    }

    static void displayInterfaceInformation(NetworkInterface netint) throws SocketException {
        out.printf(&quot;Display name: %s\n&quot;, netint.getDisplayName());
        out.printf(&quot;Name: %s\n&quot;, netint.getName());
        Enumeration&lt;InetAddress&gt; inetAddresses = netint.getInetAddresses();
        
        for (InetAddress inetAddress : Collections.list(inetAddresses)) {
            out.printf(&quot;InetAddress: %s\n&quot;, inetAddress);
        }
       
        out.printf(&quot;Up? %s\n&quot;, netint.isUp());
        out.printf(&quot;Loopback? %s\n&quot;, netint.isLoopback());
        out.printf(&quot;PointToPoint? %s\n&quot;, netint.isPointToPoint());
        out.printf(&quot;Supports multicast? %s\n&quot;, netint.supportsMulticast());
        out.printf(&quot;Virtual? %s\n&quot;, netint.isVirtual());
        out.printf(&quot;Hardware address: %s\n&quot;,
                    Arrays.toString(netint.getHardwareAddress()));
        out.printf(&quot;MTU: %s\n&quot;, netint.getMTU());
        
        out.printf(&quot;\n&quot;);

     }
}  

The following is sample output from the example program:

Display name: bge0
Name: bge0
InetAddress: /fe80:0:0:0:203:baff:fef2:e99d%2
InetAddress: /129.156.225.59
Up? true
Loopback? false
PointToPoint? false
Supports multicast? false
Virtual? false
Hardware address: [0, 3, 4, 5, 6, 7]
MTU: 1500

Display name: lo0
Name: lo0
InetAddress: /0:0:0:0:0:0:0:1%1
InetAddress: /127.0.0.1
Up? true
Loopback? true
PointToPoint? false
Supports multicast? false
Virtual? false
Hardware address: null
MTU: 8232