DNS delegation of yahoo1.com updated: May 25, 2013 3:33:53 AM
We pick m.root-servers.net, one of the 13 root servers (1), and ask it about yahoo1.com and learn that com is delegated to 13 name servers (2), so we ask j.gtld-servers.net where we learn that yahoo1.com is delegated to two name servers, including ns1.yahoo.com (3), so we ask that one and get the following answer:
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: cgi2-yahoo.com, dlsyahoo.com and emailyahoomail.com ). Worth noting is that most of the host names that point to IP group 1 use name server group 1.