go
f.ns.nic.cz has one IP number , which also has a corresponding reverse pointer. f.ns.cznic.eu and f.ns.cznic.org point to the same IP. cz and 0.2.4.e164.arpa use this as a nameserver. f.ns.nic.cz is hosted on a server in Austria even though the hostname implies Czech Republic.

f.ns.nic.cz
a records
 
+ 193.171.255.48 193.170.0.0/15 AS1853 -
+ --- -
ip numbers of host
193.171.255.48
ptrs of ip numbers
f.ns.nic.cz
ip numbers using ptr to this host
193.171.255.48
hostnames sharing ip with a-records
f.ns.cznic.eu
f.ns.cznic.org
domains using this as nameserver
0.2.4.e164.arpa
cz