We pick f.root-servers.net, one of the 13 root servers (1), and ask it about yahoo.mw and learn that mw is delegated to five name servers (2), so we ask mw.cctld.authdns.ripe.net where we learn that yahoo.mw is delegated to two name servers, including ns1.yahoo.com (3), so we ask that one and get the following answer:
Yahoo.mw is a domain controlled by five domain name servers at yahoo.com. All five of them are on different IP networks. Incoming mail for yahoo.mw is handled by one mail server at .. We are missing the IP:s of one server: .. Yahoo.mw 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: researchyahoo.com, egropus.com and geocit9es.com ). Worth noting is that most of the host names that point to IP group 1 use name server group 1.
The IP number 98.139.102.145
There are several thousand of host names that point to the IP number 98.139.102.145.