How do I convert a numeric IP address into a hostname?

How do I convert a numeric IP address like 66.29.36.130 into a hostname like www.javacertificate.net?

     we can convert the IP addtess into hostname by using the java language, in java there is a one method for conversion.

 

     String hostname = InetAddress.getByName("66.29.36.130").getHostName();  

 

     here the String variable hostname holds the converted hostname.