We pick b.root-servers.net, one of the 13 root servers (1), and ask it about wwww.adulttubes.com and learn that com is delegated to 13 name servers (2), so we ask h.gtld-servers.net where we learn that adulttubes.com is delegated to two name servers, including ns1.sedoparking.com (3), so we ask that one and get the following answer:
At least one of them point to the two IP numbers 82.98.86.164 and 82.98.86.165 together, hereafter referred to as "IP group 1".
The IP number 82.98.86.165 only
Three quarter of the several thousand of host names that point to the IP number 82.98.86.165 only (but not 82.98.86.164 ) use name server group 1 (example: awht.com, www.hit-search.de and nonnen.at ). Worth noting is that nine percent of the domains that use name server group 1 point to the IP number 82.98.86.165 only (but not 82.98.86.164 ).
The two IP numbers 82.98.86.164 and 82.98.86.165 together
All of the more than a thousands host names that point to IP group 1 use name server group 1.
The IP number 74.208.13.27
There are several hundred of host names that point to the IP number 74.208.13.27.