Know the hosting company from where a website hosting !
You might be in suspense of some websites which are using the Private Name Server [eg. ns1.bubblews.com or ns.bubblews.com]
Are you keen to know the real hosting site from where does Website buy hosting of Dedicated server or Virtual Private Server ?
Then try this site and enter the domain name you will get the details of the Hosting company even if the website is using the DNS.domain.com or Private Name-server in whois Details
The Hosting server is divided into Three Types by the hosting company :-
1. Shared Server
2. VPS Server [Virtual Private Server]
3. Dedicated Server