We pick m.root-servers.net, one of the 13 root servers (1), and ask it about cc.co.th and learn that th is delegated to seven name servers (2), so we ask ams.sns-pb.isc.org where we learn that cc.co.th is delegated to two name servers, including ns2-1551096.dragonhispeed.com (3), so we ask that one and get the following answer:
The two name servers ns1-1551096 and ns2-1551096.dragonhispeed.com together
There are six domains that use name server group 1.
All of those point only to the IP number 122.155.1.96.
All of them use only the IPv4 number 122.155.1.96. Worth noting is that six of the domains that only use the IPv4 number 122.155.1.96 use name server group 1.
The primary name server ns1-1551096.dragonhispeed.com only
Five of the six domains that use the primary name server ns1-1551096.dragonhispeed.com use name server group 1. Worth noting is that five of the domains that use name server group 1 use the primary name server ns1-1551096.dragonhispeed.com.
The IPv4 number 122.155.1.96 only
There are about fifty domains that only use the IPv4 number 122.155.1.96.