We pick a.root-servers.net, one of the 13 root servers (1), and ask it about star.pl and learn that pl is delegated to eight name servers (2), so we ask i-dns.pl where we learn that star.pl is delegated to two name servers, including ns7.webd.pl (3), so we ask that one and get the following answer:
Star.pl is a domain controlled by two domain name servers at webd.pl. Both are on different IP networks. Incoming mail for star.pl is handled by one mail server at star.pl themselves. Star.pl has one IP number (94.75.225.18), but the reverse is w14.webd.pl.
Star.pl uses the primary name server ns7.webd.pl, the two name servers ns5 and ns7.webd.pl together, hereafter referred to as "name server group 1", the IPv4 number 94.75.225.18 only and the primary mail server star.pl.
The primary name server ns7.webd.pl only
All of the several thousand of domains that use the primary name server ns7.webd.pl use name server group 1 (example: wesiory.pl, filesonick.com and karczmaczlekowka.pl ). Worth noting is that two thirds of the domains that use name server group 1 use the primary name server ns7.webd.pl.
The two name servers ns5 and ns7.webd.pl together
There are several thousand of domains that use name server group 1.
