We pick l.root-servers.net, one of the 13 root servers (1), and ask it about yahoo.pk and learn that pk is delegated to three name servers (2), so we ask root-s.pknic.pk where we learn that yahoo.pk is delegated to four name servers, including ns2.yahoo.com (3), so we ask that one and get the following answer:
Yahoo.pk is a domain controlled by four domain name servers at yahoo.com. All four of them are on different IP networks. Incoming mail for yahoo.pk is handled by one mail server at .. We are missing the IP:s of one server: .. Yahoo.pk has two IP numbers (68.180.206.184, 98.139.102.145). Both are on different IP networks.
Yahoo.pk is hosted on two servers in Sunnyvale, CA, United States even though the hostname implies Pakistan.
The two IP numbers 68.180.206.184 and 98.139.102.145 together
There are about eighty 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".
Most of those use the five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together, hereafter referred to as "name server group 1", (example: plusyahoo.biz, yahoonorway.biz and 18seconds.com ). Worth noting is that half 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
Three quarter of the more than hundred domains that use name server group 1 point to IP group 1 (example: altavista.ch, altavistausa.com and altivista.com ). Worth noting is that most of the host names that point to IP group 1 use name server group 1.
