We pick e.root-servers.net, one of the 13 root servers (1), and ask it about saintjo-remouchamps.be and learn that be is delegated to five name servers (2), so we ask london.ns.dns.be where we learn that saintjo-remouchamps.be is delegated to two name servers, including lupin.yakafaire.net (3), so we ask that one and get the following answer:
The two name servers sdns1.ovh.net and hedwige.yakafaire.net together
There are three domains that use name server group 1.
All of those use only the IPv4 number 91.121.65.209. Worth noting is that three of the domains that only use the IPv4 number 91.121.65.209 use name server group 1.
All of them are under the tld "be".
All of them point only to the IP number 91.121.65.209.
The IPv4 number 91.121.65.209 only
There are about fourty domains that only use the IPv4 number 91.121.65.209.
Eleven of them use the two name servers ns.kimsufi.com and hedwige.yakafaire.net together, hereafter referred to as "name server group 2". Worth noting is that eleven of the domains that use name server group 2 use only the IPv4 number 91.121.65.209.
The two name servers ns39148 and sdns1.ovh.net together
There are several thousand of domains that use the two name servers ns39148 and sdns1.ovh.net together, hereafter referred to as "name server group 3".