We pick f.root-servers.net, one of the 13 root servers (1), and ask it about bol.at and learn that at is delegated to eight name servers (2), so we ask n.ns.at where we learn that bol.at is delegated to two name servers, including ns1.buch.de (3), so we ask that one and get the following answer:
Bol.at is a domain controlled by three domain name servers at icsmedia.de and buch.de. Two of them are on the same IP network. Incoming mail for bol.at is handled by two mail servers at buch.de. Both are on different IP networks. Bol.at has one IP number (212.101.205.81), but the reverse is www.bol.at.
Bol.at is hosted on a server in Everswinkel, 07, Germany even though the hostname implies Austria.
The mail server mail2.buch.de
All of the about twenty domains that use the mail server mail2.buch.de use the two mail servers mail2 and ns2.buch.de together, hereafter referred to as "mail server group 1", (example: bol.ch, lion.cc and buch.ch ).
The IP number 212.101.205.81
All of the five host names that point to the IP number 212.101.205.81 point only to that ip number.
The two mail servers mai2 and ns2.buch.de together
All of the three domains that use the two mail servers mai2 and ns2.buch.de together, hereafter referred to as "mail server group 2", point only to the IP number 212.101.205.73 (example: libro.ch and libronetto.ch ).
