DNS delegation of oa.yahoomail.com updated: May 21, 2013 11:34:02 PM
Delegation
step
query
auth
servers
1
oa.yahoomail.com.
.
(a,g,j,e,i,h,k,b,l,m,f,d,c).root-servers.net.
2
oa.yahoomail.com.
com.
(c,b,e,i,g,l,j,d,a,k,m,f,h).gtld-servers.net.
3
oa.yahoomail.com.
yahoomail.com.
(ns5,ns3,ns2,ns1,ns4).yahoo.com.
We pick a.root-servers.net, one of the 13 root servers (1), and ask it about oa.yahoomail.com and learn that com is delegated to 13 name servers (2), so we ask c.gtld-servers.net where we learn that yahoomail.com is delegated to five name servers, including ns5.yahoo.com (3), so we ask that one and get the following answer: