We pick m.root-servers.net, one of the 13 root servers (1), and ask it about www.tnvat.gov.in and learn that in is delegated to nine name servers (2), so we ask ns7.cdns.net where we learn that tnvat.gov.in is delegated to one name server, including tn.nic.in (3), so we ask that one and get the following answer:
Www.tnvat.gov.in is ranked #122711 world wide as tnvat.gov.in and is hosted on a server in New Delhi, 07, India. It has 266 inlinks. It has 149 organic keywords.
The IP number 164.100.167.36
All of the three host names that point to the IP number 164.100.167.36 point only to that ip number.