import java.util.Enumeration;
import java.net.*;

public class InetAddressExample {

  public static void main(String[] args) {
    
    // Get the network interfaces and associated addresses for this host
    try {
      Enumeration<NetworkInterface> interfaceList = NetworkInterface.getNetworkInterfaces();
      if (interfaceList == null) {
        System.out.println("--No interfaces found--");
      } else {
        while (interfaceList.hasMoreElements()) {
          NetworkInterface iface = interfaceList.nextElement();
          System.out.println("Interface " + iface.getName() + ":");
          Enumeration<InetAddress> addrList = iface.getInetAddresses();
          if (!addrList.hasMoreElements()) {
            System.out.println("\t(No addresses for this interface)");
          }
          while (addrList.hasMoreElements()) {
            InetAddress address = addrList.nextElement();
            System.out.print("\tAddress "
                + ((address instanceof Inet4Address ? "(v4)"
                    : (address instanceof Inet6Address ? "(v6)" : "(?)"))));
            System.out.println(": " + address.getHostAddress());
          }
        }
      }
    } catch (SocketException se) {
      System.out.println("Error getting network interfaces:" + se.getMessage());
    }

    // Get name(s)/address(es) of hosts given on command line
    for (String host : args) {
      try {
        System.out.println(host + ":");
        InetAddress[] addressList = InetAddress.getAllByName(host);
        for (InetAddress address : addressList) {
          System.out.println("\t" + address.getHostName() + "/" + address.getHostAddress());
        }
      } catch (UnknownHostException e) {
        System.out.println("\tUnable to find address for " + host);
      }
    }
  }
}