DNS delegation of mail.yahoo.com updated: May 24, 2013 6:30:48 AM
Delegation
step
query
auth
servers
1
mail.yahoo.com.
.
(g,k,l,c,j,a,b,m,h,e,d,i,f).root-servers.net.
2
mail.yahoo.com.
com.
(k,c,j,i,l,a,f,g,d,e,m,b,h).gtld-servers.net.
3
mail.yahoo.com.
yahoo.com.
(ns4,ns2,ns1,ns3,ns5).yahoo.com.
4
login.yahoo.com.
yahoo.com.
(ns3,ns5,ns1,ns4,ns2).yahoo.com.
5
login-global.lgg1.b.yahoo.com.
yahoo.com.
(ns4,ns1,ns3,ns2,ns5).yahoo.com.
6
login-global.lgg1.b.yahoo.com.
lgg1.b.yahoo.com.
(yf6,yf7,yf5,yf4,yf1,yf2,yf8,yf3).yahoo.com.
7
eulogin.lga1.b.yahoo.com.
yahoo.com.
(ns5,ns4,ns2,ns3,ns1).yahoo.com.
8
eulogin.lga1.b.yahoo.com.
lga1.b.yahoo.com.
(yf1,yf2).yahoo.com.
9
eu-eulogin.lga1.b.yahoo.com.
lga1.b.yahoo.com.
(yf1,yf2).yahoo.com.
We pick g.root-servers.net, one of the 13 root servers (1), and ask it about mail.yahoo.com and learn that com is delegated to 13 name servers (2), so we ask k.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns4.yahoo.com (3), so we ask that one where we see a CNAME from mail.yahoo.com to login.yahoo.com, so we have to start all over again. We already know that ns3.yahoo.com is authoritative for yahoo.com (4) and ask it about login.yahoo.com and see a second CNAME from login.yahoo.com to login-global.lgg1.b.yahoo.com. We start over for the third time and we already know that ns4.yahoo.com is authoritative for yahoo.com (5) and ask it about login-global.lgg1.b.yahoo.com and learn that lgg1.b.yahoo.com is delegated to eight name servers (6), so we ask yf6.yahoo.com and see yet another CNAME from login-global.lgg1.b.yahoo.com to eulogin.lga1.b.yahoo.com. We have yet again to start all over and we already know that ns5.yahoo.com is authoritative for yahoo.com (7) and ask it about eulogin.lga1.b.yahoo.com and learn that lga1.b.yahoo.com is delegated to two name servers (8), so we ask yf1.yahoo.com and see yet another CNAME from eulogin.lga1.b.yahoo.com to eu-eulogin.lga1.b.yahoo.com. We have yet again to start all over and we already know that yf1.yahoo.com is authoritative for lga1.b.yahoo.com (9) and ask it about eu-eulogin.lga1.b.yahoo.com and get the following answer:
