DNS delegation of yahoomail.ir updated: May 19, 2013 12:43:15 PM
Delegation
step
query
auth
servers
1
yahoomail.ir.
.
(m,c,d,f,h,e,l,i,g,k,b,j,a).root-servers.net.
2
yahoomail.ir.
ir.
a.nic.ir. ns.irnic.ir. ns5.univie.ac.at.
3
yahoomail.ir.
yahoomail.ir.
(ns2,ns1).with.ir.
We pick m.root-servers.net, one of the 13 root servers (1), and ask it about yahoomail.ir and learn that ir is delegated to three name servers (2), so we ask a.nic.ir where we learn that yahoomail.ir is delegated to two name servers, including ns2.with.ir (3), so we ask that one and get the following answer:
The two name servers ns5 and ns6.inetworkweb.com together
Most of the about eighty domains that use name server group 1 point only to the IP number 176.9.45.156 (example: nddesigner.com, petrofadak.com and pishtaz-group.com ). Worth noting is that a third of the host names that point only to the IP number 176.9.45.156 use name server group 1.
The two IP numbers 158.58.186.227 and 176.9.45.156 together