We pick c.root-servers.net, one of the 13 root servers (1), and ask it about ahoo-inc.info and learn that info is delegated to six name servers (2), so we ask d0.info.afilias-nst.org where we learn that ahoo-inc.info is delegated to five name servers, including ns5.yahoo.com (3), so we ask that one and get the following answer:
Ahoo-inc.info is a domain controlled by five domain name servers at yahoo.com. All five of them are on different IP networks. Incoming mail for ahoo-inc.info is handled by one mail server at .. We are missing the IP:s of one server: .. Ahoo-inc.info has two IP numbers (68.180.206.184, 98.139.102.145). Both are on different IP networks.
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 the two IP numbers 68.180.206.184 and 98.139.102.145 together, hereafter referred to as "IP group 1", (example: yahooblog.de, yahwho.com and unti-yahoo.com ). 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 ..
