Reverse DNS not function properly

Question

Please tell me how to do a Reverse DNs in java
e.g IP address of a network machine is 192.168.0.30
Then how can i get its name (i.e machine name)?
I know that i mus thave to use a jdk 1.4
Please prvide a full solution.
Thanks.

Answer 1

The following code shows how to get the hostname for an IP address:
import java.net.*;
public class TestReverse {
     public static void main(String[] args) {
          try {
               InetAddress local = InetAddress.getByName(args[0]);
               System.out.println(local.getHostAddress());
               System.out.println(local.getHostName());
               System.out.println(local.getCanonicalHostName());
          } catch(Exception e) {
               e.printStackTrace();
}For example, running java TestReverse 207.46.230.220 produces:
207.46.230.220
www.domestic.microsoft.com
www.domestic.microsoft.comNote that it is possible to resolve names for your local network (at least it is on my Windows machine) when you put names for your IP addresses in the local host file (or of course, when you set up an internal DNS that resolves reverse lookups).
Local network ranges may not be valid on the Internet, they are valid InetAddress'es.