We pick e.root-servers.net, one of the 13 root servers (1), and ask it about ns3.chefhostdns.com and learn that com is delegated to 13 name servers (2), so we ask m.gtld-servers.net where we learn that chefhostdns.com is delegated to two name servers, including ns1.chefhostdns.com (3), so we ask that one and get the following answer:
The four name servers ns1, ns2, ns3 and ns4.chefhostdns.com together
There are eight domains that use name server group 1.
All of those are under the tld "com".
All of them use the primary name server ns1.chefhostdns.com. Worth noting is that seven of the domains that use the primary name server ns1.chefhostdns.com use name server group 1.
The primary name server ns1.chefhostdns.com only
There are twelve domains that use the primary name server ns1.chefhostdns.com.
Seven of those use name server group 1. Worth noting is that seven of the domains that use name server group 1 use the primary name server ns1.chefhostdns.com.
Five of them use the two name servers ns1 and ns2.chefhostdns.com together (but neither ns3 nor ns4.chefhostdns.com ), hereafter referred to as "name server group 2". Worth noting is that all of the domains that use name server group 2 use the primary name server ns1.chefhostdns.com.
The two name servers ns1 and ns2.chefhostdns.com together
There are five domains that use name server group 2.
Three of those use only the IPv4 number 74.50.127.111.
Three of them point only to the IP number 74.50.127.111.
