DNS delegation of mail.mini40.com updated: May 22, 2013 11:40:49 AM
Delegation
step
query
auth
servers
1
mail.mini40.com.
.
(h,a,m,c,g,i,l,e,f,d,j,k,b).root-servers.net.
2
mail.mini40.com.
com.
(g,k,j,a,f,d,m,b,i,c,e,l,h).gtld-servers.net.
3
mail.mini40.com.
mini40.com.
(ns1,ns2).ukdnsservers.co.uk.
4
aspmx.l.google.com.
com.
(b,k,g,a,d,i,f,l,j,e,c,h,m).gtld-servers.net.
5
aspmx.l.google.com.
google.com.
(ns3,ns1,ns4,ns2).google.com.
We pick h.root-servers.net, one of the 13 root servers (1), and ask it about mail.mini40.com and learn that com is delegated to 13 name servers (2), so we ask g.gtld-servers.net where we learn that mini40.com is delegated to two name servers, including ns1.ukdnsservers.co.uk (3), so we ask that one where we see a CNAME from mail.mini40.com to aspmx.l.google.com, so we have to start all over again. We already know that b.gtld-servers.net is authoritative for com (4) and ask it about aspmx.l.google.com and learn that google.com is delegated to four name servers (5), so we ask ns3.google.com and get the following answer:
