dns.java

import java.net.*;
import java.io.*;
import java.util.*;

public class dns
{
 public static void main(String[] args)
 {
  int n;
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
  do
  {
   System.out.println("1.DNS \n2.Reverse DNS \n3.Exit \n");
   System.out.println("Enter your choice");
   n = Integer.parseInt(System.console().readLine());
   if(n==1)
   {
    try
    {
     System.out.println("Host Name ");
     String hname=in.readLine();
     InetAddress address;
     address = InetAddress.getByName(hname);
     System.out.println("Host Name:" + address.getHostName());
     System.out.println("IP:"+address.getHostAddress());
    }
    catch(IOException ioe)
    {
     ioe.printStackTrace();
    }
   }
   if(n==2)
   {
    try
    {
       System.out.println("Enter IP address");
       String ipstr = in.readLine();
       InetAddress ia = InetAddress.getByName(ipstr);
       System.out.println("IP:"+ipstr);
       System.out.println("Host Name:"+ia.getHostName());
     }
    catch(IOException ioe)
    {
     ioe.printStackTrace();
    }
   }
  }while(!(n==3));
 }
}