DNS delegation of yns1.yahoo.com updated: May 23, 2013 12:41:32 AM
Delegation
step
query
auth
servers
1
yns1.yahoo.com.
.
(e,f,a,m,l,k,b,h,i,g,j,c,d).root-servers.net.
2
yns1.yahoo.com.
com.
(f,j,c,d,g,e,a,k,h,i,m,l,b).gtld-servers.net.
3
yns1.yahoo.com.
yahoo.com.
(ns3,ns4,ns1,ns2,ns5).yahoo.com.
We pick e.root-servers.net, one of the 13 root servers (1), and ask it about yns1.yahoo.com and learn that com is delegated to 13 name servers (2), so we ask f.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns3.yahoo.com (3), so we ask that one and get the following answer:
Incoming mail for yns1.yahoo.com is handled by one mail server at .. We are missing the IP:s of one server: .. Yns1.yahoo.com has one IP number (67.195.1.92), which also has a corresponding reverse pointer.