We pick b.root-servers.net, one of the 13 root servers (1), and ask it about prokapital.ee and learn that ee is delegated to eight name servers (2), so we ask ee.aso.ee where we learn that prokapital.ee is delegated to two name servers, including ns.elion.ee (3), so we ask that one and get the following answer:
Prokapital.ee is a domain controlled by two domain name servers at elion.ee having a total of two IP numbers. Both are on different IP networks. We are missing the IP:s of one server: ns.elion.ee. Incoming mail for prokapital.ee is handled by one mail server at prokapital.ee themselves. Prokapital.ee has one IP number (213.219.77.154), which also has a corresponding reverse pointer.
All of the several thousand of domains that use the primary name server ns.elion.ee use name server group 1 (example: greendorp.ee, bennetpuit.ee and sildest.ee ). Worth noting is that most of the domains that use name server group 1 use the primary name server ns.elion.ee.
The mail server prokapital.ee only
All of the three domains that only use the mail server prokapital.ee start with "prokapital".
The two name servers ns and ns2.elion.ee together
There are several thousand of domains that use name server group 1.