DNS delegation of s2011a2.psmtp.com updated: Jun 20, 2013 12:47:03 AM
Delegation
step
query
auth
servers
1
s2011a2.psmtp.com.
.
(i,f,m,d,a,k,l,g,e,c,h,j,b).root-servers.net.
2
s2011a2.psmtp.com.
com.
(f,g,j,e,b,m,d,l,h,i,c,k,a).gtld-servers.net.
3
s2011a2.psmtp.com.
psmtp.com.
(ns2,ns1,ns4,ns3).google.com.
We pick i.root-servers.net, one of the 13 root servers (1), and ask it about s2011a2.psmtp.com and learn that com is delegated to 13 name servers (2), so we ask f.gtld-servers.net where we learn that psmtp.com is delegated to four name servers, including ns2.google.com (3), so we ask that one and get the following answer: