DNS delegation of yahoo-inc.com updated: May 20, 2013 5:04:38 PM
Delegation
step
query
auth
servers
1
yahoo-inc.com.
.
(a,e,k,l,j,g,f,i,m,c,h,b,d).root-servers.net.
2
yahoo-inc.com.
com.
(f,a,b,d,i,l,h,e,g,m,k,j,c).gtld-servers.net.
3
yahoo-inc.com.
yahoo-inc.com.
(ns2,ns3,ns1,ns4,ns5).yahoo.com.
We pick a.root-servers.net, one of the 13 root servers (1), and ask it about yahoo-inc.com and learn that com is delegated to 13 name servers (2), so we ask f.gtld-servers.net where we learn that yahoo-inc.com is delegated to five name servers, including ns2.yahoo.com (3), so we ask that one and get the following answer:
Yahoo-inc.com 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-inc.com is handled by four mail servers also at yahoo.com. Some of them are on the same IP network. Yahoo-inc.com 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 IP group 1 (example: yahooluv.com, yahoosearch.net and kdyahoo.com ). Worth noting is that three quarter 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.