We pick a.root-servers.net, one of the 13 root servers (1), and ask it about ayahooantispyware.com and learn that com is delegated to 13 name servers (2), so we ask i.gtld-servers.net where we learn that ayahooantispyware.com is delegated to five name servers, including ns2.yahoo.com (3), so we ask that one and get the following answer:
The two IP numbers 68.180.206.184 and 98.139.102.145 together
Most of the several thousand of host names that point to the two IP numbers 68.180.206.184 and 98.139.102.145 together, hereafter referred to as "IP group 1", use the five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together, hereafter referred to as "name server group 1", (example: yahoosoutheastasia.com, koehler29i29yahoo.com and yahoo-clubs.com ). Worth noting is that two thirds of the domains that use name server group 1 point to IP group 1.
The five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together
Two thirds of the several thousand of domains that use name server group 1 point to IP group 1 (example: yahoonew.net, yahoomail.com.br and yahookids.dk ). Worth noting is that most of the host names that point to IP group 1 use name server group 1.
The mail server. Only
There are several thousand of domains that only use the mail server ..