We pick d.root-servers.net, one of the 13 root servers (1), and ask it about jo.pl and learn that pl is delegated to eight name servers (2), so we ask h-dns.pl where we learn that jo.pl is delegated to two name servers, including ns2.t.pl (3), so we ask that one and get the following answer:
Jo.pl is a domain controlled by two domain name servers at t.pl. Two domain name servers have the same IP number. Incoming mail for jo.pl is handled by one mail server also at t.pl. Jo.pl has one IP number (193.218.154.103), but the reverse is poczta.t.pl.
There are ten host names that point only to the IP number 193.218.154.103.
Six of those use only the mail server mx.t.pl. Worth noting is that six of the domains that only use the mail server mx.t.pl point only to the IP number 193.218.154.103.
Six of them use name server group 1. Worth noting is that all of the domains that use name server group 1 point only to the IP number 193.218.154.103.
The two name servers ns1 and ns2.t.pl together
There are six domains that use name server group 1.
All of those point only to the IP number 193.218.154.103. Worth noting is that six of the host names that point only to the IP number 193.218.154.103 use name server group 1.
All of them use only the mail server mx.t.pl. Worth noting is that six of the domains that only use the mail server mx.t.pl use name server group 1.
The mail server mx.t.pl only
There are seven domains that only use the mail server mx.t.pl.
Six of those use name server group 1. Worth noting is that all of the domains that use name server group 1 use only the mail server mx.t.pl.
Six of them point only to the IP number 193.218.154.103. Worth noting is that six of the host names that point only to the IP number 193.218.154.103 use only the mail server mx.t.pl.
One of them use the two name servers ns3 and ns4.ut.pl together.
One of them point only to the IP number 178.250.45.37.
