We pick b.root-servers.net, one of the 13 root servers (1), and ask it about xvideos.ro and learn that ro is delegated to six name servers (2), so we ask ns-ext.isc.org where we learn that xvideos.ro is delegated to four name servers, including ns2.serverstack.com (3), so we ask that one and get the following answer:
Four percent of them use name server group 2. Worth noting is that every fifth of the domains that use name server group 2 point only to the IP number 141.0.173.27.
The four name servers ns1, ns2, ns3 and ns4.serverstack.com together
There are more than two hundred domains that use name server group 2.
Every fifth of those point only to the IP number 141.0.173.27 (example: bbwlovers.com and pornvideos.com ). Worth noting is that two percent of the host names that point only to the IP number 141.0.173.27 use name server group 2.