We pick g.root-servers.net, one of the 13 root servers (1), and ask it about ns3.rasio.org and learn that org is delegated to six name servers (2), so we ask a2.org.afilias-nst.info where we learn that rasio.org is delegated to two name servers, including ns1.rasio.org (3), so we ask that one and get the following answer:
The two name servers ns1 and ns2.rasio.org together
There are seven domains that use name server group 1.
All of those use the primary name server ns1.rasio.org (example: ns4.rasio.org ). Worth noting is that all of the domains that use the primary name server ns1.rasio.org use name server group 1.
All of them are under the tld "org".
The primary name server ns1.rasio.org only
All of the seven domains that use the primary name server ns1.rasio.org 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.rasio.org.
The IPv4 number 207.7.86.31 only
There are about twenty domains that only use the IPv4 number 207.7.86.31.
Three quarter of those use the two name servers ns3 and ns4.rasio.org together, hereafter referred to as "name server group 2", (example: worldwidecorp.biz, semeru.co.id and sentralbesi.com ). Worth noting is that all of the domains that use name server group 2 use only the IPv4 number 207.7.86.31.
The two name servers ns3 and ns4.rasio.org together
There are about twenty domains that use name server group 2.
All of those use only the IPv4 number 207.7.86.31 (example: steffiani.com ). Worth noting is that three quarter of the domains that only use the IPv4 number 207.7.86.31 use name server group 2.
All of them point only to the IP number 207.7.86.31.
Three quarter of them use the primary name server ns3.rasio.org. Worth noting is that all of the domains that use the primary name server ns3.rasio.org use name server group 2.