DNS delegation of vg.s9b1.psmtp.com updated: May 25, 2013 10:21:49 PM
Delegation
step
query
auth
servers
1
vg.s9b1.psmtp.com.
.
(i,m,g,k,h,d,l,c,e,a,j,f,b).root-servers.net.
2
vg.s9b1.psmtp.com.
com.
(a,i,l,k,d,m,b,j,g,h,c,e,f).gtld-servers.net.
3
vg.s9b1.psmtp.com.
psmtp.com.
(ns4,ns1,ns2,ns3).google.com.
We pick i.root-servers.net, one of the 13 root servers (1), and ask it about vg.s9b1.psmtp.com and learn that com is delegated to 13 name servers (2), so we ask a.gtld-servers.net where we learn that psmtp.com is delegated to four name servers, including ns4.google.com (3), so we ask that one and get the following answer: