We pick b.root-servers.net, one of the 13 root servers (1), and ask it about f.to and learn that to is delegated to five name servers (2), so we ask to.cctld.authdns.ripe.net where we learn that f.to is delegated to two name servers, including ns3.dnsjp.com (3), so we ask that one and get the following answer:
F.to is a domain controlled by two domain name servers at dnsjp.com. Both are on different IP networks. F.to has one IP number (203.183.42.9), but the reverse is ?.
Five of them point to the IP number 203.183.42.9. Worth noting is that five of the host names that point to the IP number 203.183.42.9 use the name server ns3.dnsjp.com.
The IP number 203.183.42.9
There are ten host names that point to the IP number 203.183.42.9.
Nine of those point only to that ip number.
Five of them use the name server ns3.dnsjp.com. Worth noting is that five of the domains that use the name server ns3.dnsjp.com point to the IP number 203.183.42.9.
Five of them use the name server ns1.dnsjp.com. Worth noting is that five of the domains that use the name server ns1.dnsjp.com point to the IP number 203.183.42.9.
The two name servers ns1 and ns3.dnsjp.com together
There are about ninety domains that use name server group 1.