DNS delegation of a.ext.ru updated: May 20, 2013 11:30:42 AM
Delegation
step
query
auth
servers
1
a.ext.ru.
.
(j,m,d,b,g,c,a,h,k,l,i,f,e).root-servers.net.
2
a.ext.ru.
ru.
(f,a,e,b,d).dns.ripn.net.
3
a.ext.ru.
ext.ru.
(ns01,ns02).comcor-tv.ru.
We pick j.root-servers.net, one of the 13 root servers (1), and ask it about a.ext.ru and learn that ru is delegated to five name servers (2), so we ask f.dns.ripn.net where we learn that ext.ru is delegated to two name servers, including ns01.comcor-tv.ru (3), so we ask that one and get the following answer:
A.ext.ru is a domain controlled by two domain name servers at comcor-tv.ru. Both are on the same IP network. A.ext.ru has one IP number (217.10.39.82), which also has a corresponding reverse pointer.