Java Reverse DNS

gistfile1.java

import java.net.InetAddress;

public class reversedns
{

  public static void main(String args[])
  {
    try {
      InetAddress addr = InetAddress.getByName("172.16.0.105");
      System.out.println(addr.getHostName());
    }
    catch (Exception e)
    {
      System.err.println("Error: " + e.getMessage());
    }
  }
}