DNSLookup.java Source code

Introduction

Here is the source code for DNSLookup.java

Source

import java.net.InetAddress;
import java.net.UnknownHostException;

public class DNSLookup {
    public static void main(String args[]) {
        try {
            InetAddress host;
            if (args.length == 0) {
                host = InetAddress.getLocalHost();
            } else {
                host = InetAddress.getByName(args[0]);
            }
            System.out.println("Host:'" + host.getHostName() + "' has address: " + host.getHostAddress());
            byte bytes[] = host.getAddress();
            int fourBytes[] = new int[bytes.length];
            for (int i = 0, n = bytes.length; i < n; i++) {
                fourBytes[i] = bytes[i] & 255;
            }
            System.out.println("\t" + fourBytes[0] + "." + fourBytes[1] + "." + fourBytes[2] + "." + fourBytes[3]);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}