We pick g.root-servers.net, one of the 13 root servers (1), and ask it about tg-hosting.ru and learn that ru is delegated to five name servers (2), so we ask b.dns.ripn.net where we learn that tg-hosting.ru is delegated to two name servers, including ns2.tg-hosting.ru (3), so we ask that one and get the following answer:
All of the six domains that use the primary name server ns1.tg-hosting.ru use name server group 1. Worth noting is that six of the domains that use name server group 1 use the primary name server ns1.tg-hosting.ru.
The two name servers ns1 and ns2.tg-hosting.ru together
There are seven domains that use name server group 1.
All of those use only the IPv4 number 188.8.131.52. Worth noting is that seven of the domains that only use the IPv4 number 184.108.40.206 use name server group 1.