DNS delegation of mrin3.yahoo.com updated: May 24, 2013 4:20:32 AM
Delegation
step
query
auth
servers
1
mrin3.yahoo.com.
.
(d,c,g,m,h,b,j,a,k,i,e,f,l).root-servers.net.
2
mrin3.yahoo.com.
com.
(g,c,d,f,m,i,a,b,l,k,e,h,j).gtld-servers.net.
3
mrin3.yahoo.com.
yahoo.com.
(ns2,ns3,ns1,ns5,ns4).yahoo.com.
We pick d.root-servers.net, one of the 13 root servers (1), and ask it about mrin3.yahoo.com and learn that com is delegated to 13 name servers (2), so we ask g.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns2.yahoo.com (3), so we ask that one and get the following answer:
Incoming mail for mrin3.yahoo.com is handled by one mail server at .. We are missing the IP:s of one server: .. Mrin3.yahoo.com has one IP number (216.145.48.28), which also has a corresponding reverse pointer.