DNS delegation of mail.ccistech.com updated: May 20, 2013 9:06:48 AM
Delegation
step
query
auth
servers
1
mail.ccistech.com.
.
(e,i,j,c,g,b,k,h,l,a,m,f,d).root-servers.net.
2
mail.ccistech.com.
com.
(j,a,m,l,f,h,c,e,g,d,i,k,b).gtld-servers.net.
3
mail.ccistech.com.
ccistech.com.
(ns,ns2).rackspace.com.
4
excentus.com.s9a1.psmtp.com.
com.
(d,e,a,h,i,m,j,l,k,f,g,b,c).gtld-servers.net.
5
excentus.com.s9a1.psmtp.com.
psmtp.com.
(ns1,ns3,ns4,ns2).google.com.
We pick e.root-servers.net, one of the 13 root servers (1), and ask it about mail.ccistech.com and learn that com is delegated to 13 name servers (2), so we ask j.gtld-servers.net where we learn that ccistech.com is delegated to two name servers, including ns.rackspace.com (3), so we ask that one where we see a CNAME from mail.ccistech.com to excentus.com.s9a1.psmtp.com, so we have to start all over again. We already know that d.gtld-servers.net is authoritative for com (4) and ask it about excentus.com.s9a1.psmtp.com and learn that psmtp.com is delegated to four name servers (5), so we ask ns1.google.com and get the following answer: