We pick a.root-servers.net, one of the 13 root servers (1), and ask it about ns4.entrelineashost.com and learn that com is delegated to 13 name servers (2), so we ask a.gtld-servers.net where we learn that entrelineashost.com is delegated to two name servers, including ns1.entrelineashost.com (3), so we ask that one and get the following answer:
The four name servers ns1, ns2, ns3 and ns4.entrelineashost.com together
There are eight domains that use name server group 1.
All of those use the primary name server ns1.entrelineashost.com. Worth noting is that all of the domains that use the primary name server ns1.entrelineashost.com use name server group 1.
Six of them are under the tld "com".
Four of them point only to the IP number 65.60.35.66.
The primary name server ns1.entrelineashost.com only
All of the eight domains that use the primary name server ns1.entrelineashost.com use name server group 1. Worth noting is that all of the domains that use name server group 1 use the primary name server ns1.entrelineashost.com.