PPT Slide

import java.net.*;

public class nslookup {

public static void main(String arg[]){

if (arg.length == 0) showUsage();

InetAddress[] names = null;

try{

names = InetAddress.getAllByName(arg[0]);

}

catch (UnknownHostException e){

System.err.println("Error: Unknown Host: " + arg[0]);

System.exit(1);

}

for (int i=0; i< names.length; i++)

System.out.println

("\nName: " + names[i].getHostName() +

"\nAddress: " + names[i].getHostAddress());

}//main

public static void showUsage(){

System.out.println

("Usage:\n\tnslookup <ip name>");

System.exit(0);

}//showUsage

}//nslookup

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