We pick f.root-servers.net, one of the 13 root servers (1), and ask it about com.mn and learn that mn is delegated to ten name servers (2), so we ask ns2.magic.mn and get the following answer:
There are about thirty domains that use the name server ns1.magic.mn.
Three quarter of those use the two name servers ns1 and ns3.magic.mn together, hereafter referred to as "name server group 1", (example: mol.mn, weblog.mn and zar.mn ).
The two name servers ns1 and ns3.magic.mn together
There are about thirty domains that use name server group 1.
Eight of those use mail server group 1.
Seven of them use mail server group 2.
Four of them use mail server group 3.
Three of them point only to the IP number 202.131.4.13.
The three name servers ns1, ns2 and ns3.magic.mn together
There are one domains that use the three name servers ns1, ns2 and ns3.magic.mn together.
All of those point only to the IP number 174.122.93.219.
All of them use mail server group 2.
The IP number 202.131.0.10
There are two host names that point to the IP number 202.131.0.10.
One of those use the five name servers ns1, ns2, ns3, ns4 and ns5.magic.mn together, hereafter referred to as "name server group 2", (example: magic.mn ).
One of them point only to that ip number (example: ns1.magic.mn ).
There are two host names that point to the IP number 202.131.224.80.
One of those point to IP group 1.
One of them point only to that ip number (example: ns3.magic.mn ).
One of them use name server group 2.
The five name servers ns1, ns2, ns3, ns4 and ns5.magic.mn together
All of the one domains that use name server group 2 point to IP group 1. Worth noting is that all of the host names that point to IP group 1 use name server group 2.