We pick j.root-servers.net, one of the 13 root servers (1), and ask it about lipniczanin.pl and learn that pl is delegated to eight name servers (2), so we ask d-dns.pl where we learn that lipniczanin.pl is delegated to three name servers, including ns3.hostit.pl (3), so we ask that one and get the following answer:
The two last resort mail servers a.altmx1.prokonto.pl and a.altmx2.prokonto.pl together
All of the about fourty domains that use last resort mail server group 1 use the primary mail server a.mx.prokonto.pl (example: ryjbuk.pl, muksplock.pl and businessdirectory24.com ). Worth noting is that three quarter of the domains that use the primary mail server a.mx.prokonto.pl use last resort mail server group 1.
The primary name server ns1.hostit.pl only
There are several hundred of domains that use the primary name server ns1.hostit.pl.
Most of those use the three name servers ns1, ns2 and ns3.hostit.pl together, hereafter referred to as "name server group 2", (example: gruszczyk.net, enhin.com.pl and domy.net ). Worth noting is that most of the domains that use name server group 2 use the primary name server ns1.hostit.pl.
There are about fourty domains that use the primary mail server a.mx.prokonto.pl.
Three quarter of those use last resort mail server group 1 (example: nissanzone.pl, codeopen.pl and fanimal.pl ). Worth noting is that all of the domains that use last resort mail server group 1 use the primary mail server a.mx.prokonto.pl.
Half of them use the primary name server ns1.hostit.pl. Worth noting is that six percent of the domains that use the primary name server ns1.hostit.pl use name server group 1.
The three mail servers a.altmx1.prokonto.pl, a.altmx2.prokonto.pl and a.mx.prokonto.pl together