We pick c.root-servers.net, one of the 13 root servers (1), and ask it about d.mw and learn that mw is delegated to five name servers (2), so we ask sec3.apnic.net where we learn that d.mw is delegated to two name servers, including ns3.mailart.com (3), so we ask that one and get the following answer:
A third of them use the two name servers ns2 and ns3.mailart.com together, hereafter referred to as "name server group 1", (example: act.cx, party.gs and 666.as ).
Nine of them use only the mail server mail.111.gs.
The two name servers ns2 and ns3.mailart.com together
There are several hundred of domains that use name server group 1.
Most of those point only to the IP number 180.42.26.116 (example: a.mu, b.pn and cow.cx ). Worth noting is that a third of the host names that point only to the IP number 180.42.26.116 use name server group 1.
Ten of them point only to the IP number 180.42.26.119.
There are several hundred of host names that point only to the IP number 180.42.26.116.
A third of those use name server group 1 (example: 50.st, many.cx and y.mw ). Worth noting is that most of the domains that use name server group 1 point only to the IP number 180.42.26.116.