We pick g.root-servers.net, one of the 13 root servers (1), and ask it about hosting.nl.nu and learn that nu is delegated to eight name servers (2), so we ask c.nic.nu where we learn that nl.nu is delegated to five name servers, including ns1.worldwidedns.net (3), so we ask that one and learn that hosting.nl.nu is delegated to four name servers (4), so we ask ns3.hosting.nl.nu and get the following answer:
The two name servers ns1 and ns2.hosting.nl.nu together
There are ten domains that use name server group 1.
Four of those point only to the IP number 212.72.184.94.
Two of them point only to the IP number 212.72.184.90. Worth noting is that two of the host names that point only to the IP number 212.72.184.90 use name server group 1.
Two of them point only to the IP number 212.72.184.93. Worth noting is that two of the host names that point only to the IP number 212.72.184.93 use name server group 1.
Two of them point only to the IP number 212.72.184.97.
Two of the nine host names that point only to the IP number 212.72.184.93 use name server group 1. Worth noting is that two of the domains that use name server group 1 point only to the IP number 212.72.184.93.
The IP number 212.72.184.90 only
Two of the twelve host names that point only to the IP number 212.72.184.90 use name server group 1. Worth noting is that two of the domains that use name server group 1 point only to the IP number 212.72.184.90.
The three name servers rootzone.nl.nu, ns1.hosting.nl.nu and ns2.hosting.nl.nu together
