DNS delegation of c.cz updated: May 20, 2013 11:23:12 AM
Delegation
step
query
auth
servers
1
c.cz.
.
(g,e,d,l,m,h,j,i,k,c,b,f,a).root-servers.net.
2
c.cz.
cz.
(d,f,b,c,a).ns.nic.cz.
3
c.cz.
c.cz.
(ns2,ns).pardub.cz.
We pick g.root-servers.net, one of the 13 root servers (1), and ask it about c.cz and learn that cz is delegated to five name servers (2), so we ask d.ns.nic.cz where we learn that c.cz is delegated to two name servers, including ns2.pardub.cz (3), so we ask that one and get the following answer:
C.cz is a domain controlled by two domain name servers at pardub.cz. Two domain name servers have the same IP number. C.cz has one IP number (89.203.213.8), but the reverse is mail.infosystem.cz.
The two name servers ns and ns2.pardub.cz together
Nine of the several hundred of domains that use name server group 1 point only to the IP number 81.2.210.36 (example: vstupenka.cz, oz.cz and sorm.cz ).
The IP number 89.203.213.8 only
Two percent of the several hundred of host names that point only to the IP number 89.203.213.8 use only the mail server mail.infosystem.cz (example: tradice.cz ).