We pick l.root-servers.net, one of the 13 root servers (1), and ask it about tlen.pl and learn that pl is delegated to eight name servers (2), so we ask h-dns.pl where we learn that tlen.pl is delegated to two name servers, including ns1.go2.pl (3), so we ask that one and get the following answer:
Tlen.pl is a domain controlled by two domain name servers at go2.pl. Both are on different IP networks. Incoming mail for tlen.pl is handled by nine mail servers also at go2.pl. All nine of them are on the same IP network. Tlen.pl has one IP number (193.17.41.103), but the reverse is o2.pl.
There are 13 domains that use the mail server mx8.go2.pl.
All of those use the nine mail servers mx11, mx13, mx3, mx4, mx5, mx6, mx7, mx8 and mx9.go2.pl together, hereafter referred to as "mail server group 1".
Three of them point to the IP number 193.17.41.103. Worth noting is that three of the host names that point to the IP number 193.17.41.103 use the mail server mx8.go2.pl.
The IP number 193.17.41.103
There are about twenty host names that point to the IP number 193.17.41.103.
Six of them use the name server ns1.go2.pl. Worth noting is that six of the domains that use the name server ns1.go2.pl point to the IP number 193.17.41.103.
The nine mail servers mx11, mx13, mx3, mx4, mx5, mx6, mx7, mx8 and mx9.go2.pl together
Five of the 13 domains that use mail server group 1 point only to the IP number 193.17.41.99.
The two name servers ns1 and ns2.go2.pl together
There are about a hundred domains that use name server group 1.
