import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;

class UdpClient
{
    public static void main (String args[]) throws Exception
    {
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a hostname: ");
        // host name
        String hostname = scan.next();
        // socket
        DatagramSocket clientSocket = new DatagramSocket();
        InetAddress ipAddress = InetAddress.getByName(hostname);
        //String message = "0471001000000";
        byte[] data = { (byte)0x7F, (byte)0xA9, (byte)0x01, (byte)0x00, (byte)0x00, (byte)0x01, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x04, (byte)0x10, (byte)0x11, (byte)0x05, (byte)0xA8, (byte)0x04, (byte)0x72, (byte)0x65, (byte)0x63, (byte)0x62, (byte)0x02, (byte)0x66, (byte)0x72, (byte)0x00, (byte)0x00, (byte)0x01, (byte)0x00, (byte)0x01 };
        // datagram packet
        DatagramPacket sendPacket = new DatagramPacket(data, data.length, ipAddress, 53);
        // send the packet
        clientSocket.send(sendPacket);
        // set a receive timeout, 2000 milliseconds
        // packet for receive
        byte[] rdata = new byte[1024];
        DatagramPacket receivePacket = new DatagramPacket(rdata, rdata.length, ipAddress, 53);
        // wait for a response from the server
        clientSocket.receive(receivePacket);
        System.out.println("Host Name: " + ipAddress.getHostName());
        System.out.println("Canonical Host Name: " + ipAddress.getCanonicalHostName());
        System.out.println("Local Host: " + ipAddress.getLocalHost());
        System.out.println("Loopback Address: " + ipAddress.getLoopbackAddress());
        System.out.println("IPv4: " + ipAddress.getHostAddress());
        String serverMessage = new String(receivePacket.getData(), 0, receivePacket.getLength());
        System.out.println("FROM SERVER: " + serverMessage);
    }
}