DNS delegation of ns.usa-noujan.com updated: May 22, 2013 4:01:28 AM
Delegation
step
query
auth
servers
1
ns.usa-noujan.com.
.
(e,b,d,a,k,l,m,i,h,c,f,g,j).root-servers.net.
2
ns.usa-noujan.com.
com.
(l,g,d,f,k,c,i,b,h,e,j,a,m).gtld-servers.net.
We pick e.root-servers.net, one of the 13 root servers (1), and ask it about ns.usa-noujan.com and learn that com is delegated to 13 name servers (2), so we ask l.gtld-servers.net and get the following answer:
All of the three domains that use the name server ns.usa-noujan.com use the two name servers ns and ns2.usa-noujan.com together, hereafter referred to as "name server group 1".
The two name servers ns and ns2.usa-noujan.com together
All of the three domains that use name server group 1 are under the tld "com".