IPv6 indicator

package hu.jmk.ipv6;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;

import org.xbill.DNS.*;

public class IPv6Indicator extends Applet {
    static final long serialVersionUID = 0x1;

    public void init() {
        getLocalHostName();
        getLocalIPv4Addresses();
        getLocalIPv6Addresses();
        getRemoteIPv4Addresses( "google.hu" );
        getRemoteIPv6Addresses( "origo.hu" );
    }

    public void paint( Graphics g ) {
        setBackground( Color.BLUE );
    }

    public String getLocalHostName() {
        String localHostnameString = null;
        try {
            java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost();
            localHostnameString = localMachine.getHostName();
            System.out.printf( "Local machine hostname: %s\n", localHostnameString );
        } catch ( UnknownHostException e ) {
        }

        return localHostnameString;
    }

    public String[] getLocalIPv4Addresses() {
        System.out.printf( "Local IPv4 addresses:" );
        return getLocalAddresses( 4 );
    }

    public String[] getLocalIPv6Addresses() {
        System.out.printf( "Local IPv6 adresses:" );
        return getLocalAddresses( 16 );
    }

    public String[] getLocalAddresses( int segments ) {
        ArrayList<String> localAddresses = new ArrayList<String>();

        try {
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            for ( NetworkInterface networkInterface : Collections.list( networkInterfaces ) ) {
                if ( networkInterface.isUp() && !networkInterface.isLoopback() ) {
                    List<InterfaceAddress> interfaceAddresses = networkInterface.getInterfaceAddresses();
                    for ( InterfaceAddress interfaceAddress : interfaceAddresses ) {
                        InetAddress inetAddress = interfaceAddress.getAddress();
                        if ( ( inetAddress.getAddress().length == segments ) && !inetAddress.isAnyLocalAddress() && !inetAddress.isLinkLocalAddress() && !inetAddress.isLoopbackAddress() && !inetAddress.isMCGlobal() && !inetAddress.isMCLinkLocal() && !inetAddress.isMCNodeLocal() && !inetAddress.isMCOrgLocal() && !inetAddress.isMCSiteLocal() && !inetAddress.isMulticastAddress() && !inetAddress.isSiteLocalAddress() ) {
                            boolean isTeredo = false;
                            if ( ( interfaceAddress.getNetworkPrefixLength() == 32 ) && ( inetAddress.getAddress()[0] == 32 ) && ( inetAddress.getAddress()[1] == 1 ) && ( inetAddress.getAddress()[2] == 0 ) && ( inetAddress.getAddress()[3] == 0 ) ) {
                                isTeredo = true;
                            }
                            if ( !isTeredo ) {
                                localAddresses.add( inetAddress.getHostAddress() );
                                System.out.printf( " %s", inetAddress.getHostAddress() );
                            }
                        }
                    }
                }
            }
            System.out.printf( "\n" );
        } catch ( SocketException e ) {
            System.out.printf( "\n" );
            System.out.println( e.getMessage() );
        }

        String[] localAddressesArray = new String[localAddresses.size()];

        return localAddresses.toArray( localAddressesArray );
    }

    public String[] getRemoteIPv4Addresses( String hostname ) {
        System.out.printf( "Remote IPv4 addresses:" );
        return getRemoteAddresses( hostname, Type.A );
    }

    public String[] getRemoteIPv6Addresses( String hostname ) {
        System.out.printf( "Remote IPv6 addresses:" );
        return getRemoteAddresses( hostname, Type.AAAA );
    }

    public String[] getRemoteAddresses( String hostName, int type ) {
        ArrayList<String> remoteAddresses = new ArrayList<String>();

        try {
            Lookup lookup = new Lookup( hostName, type );
            lookup.run();
            if ( lookup.getResult() == Lookup.SUCCESSFUL ) {
                for ( int i = 0; i < lookup.getAnswers().length; i++ ) {
                    remoteAddresses.add( lookup.getAnswers()[i].rdataToString() );
                    System.out.printf( " %s", lookup.getAnswers()[i].rdataToString() );
                }
            }
            System.out.printf( "\n" );
        } catch ( TextParseException e ) {
            System.out.printf( "\n" );
            System.out.println( e.getMessage() );
        }

        String[] remoteAddressesArray = new String[remoteAddresses.size()];

        return remoteAddresses.toArray( remoteAddressesArray );
    }
}