DNS delegation of yf8.yahoo.com updated: May 25, 2013 8:10:20 PM
Delegation
step
query
auth
servers
1
yf8.yahoo.com.
.
(c,i,e,j,k,h,d,b,l,m,g,f,a).root-servers.net.
2
yf8.yahoo.com.
com.
(d,b,j,i,l,h,c,m,f,k,e,g,a).gtld-servers.net.
3
yf8.yahoo.com.
yahoo.com.
(ns5,ns1,ns3,ns4,ns2).yahoo.com.
We pick c.root-servers.net, one of the 13 root servers (1), and ask it about yf8.yahoo.com and learn that com is delegated to 13 name servers (2), so we ask d.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns5.yahoo.com (3), so we ask that one and get the following answer:
Incoming mail for yf8.yahoo.com is handled by one mail server at .. We are missing the IP:s of one server: .. Yf8.yahoo.com has one IP number (200.152.174.48), which also has a corresponding reverse pointer.