We pick i.root-servers.net, one of the 13 root servers (1), and ask it about h.mu and learn that mu is delegated to four name servers (2), so we ask anycast1.irondns.net where we learn that h.mu is delegated to two name servers, including ns3.mailart.com (3), so we ask that one and get the following answer:
H.mu is a domain controlled by two domain name servers at mailart.com. Both are on the same IP network. Incoming mail for h.mu is handled by one mail server at h.mu themselves. H.mu has one IP number (180.42.26.116), but the reverse is ?.
H.mu is hosted on a server in Tokyo, 40, Japan even though the hostname implies Mauritius.
The name server ns3.mailart.com
All of the several hundred of domains that use the name server ns3.mailart.com use the two name servers ns2 and ns3.mailart.com together, hereafter referred to as "name server group 1", (example: pit.cx, 6.kz and dragon.st ).
The IP number 180.42.26.116
All of the more than a thousands host names that point to the IP number 180.42.26.116 point only to that ip number (example: www.8.cx, *.ten.st and air.ms ).
The two name servers ns2 and ns3.mailart.com together
