go
b.ns.nic.cz has one IP number , which also has a corresponding reverse pointer. b.ns.cznic.org and b.ns.xn--hkyrky-ptac70bc.cz point to the same IP. cz, nic.cz, dnssec.cz, cznic.org, dnstester.cz and at least ten other hosts use this as a nameserver. b.ns.nic.cz is hosted on a server in Czech Republic.

b.ns.nic.cz
a records
 
+ 217.31.205.188 217.31.192.0/20 AS25192 -
+ --- -
ip numbers of host
217.31.205.188
ptrs of ip numbers
b.ns.nic.cz
ip numbers using ptr to this host
217.31.205.188
hostnames sharing ip with a-records
b.ns.cznic.org
b.ns.xn--hkyrky-ptac70bc.cz
domains using this as nameserver
0.2.4.e164.arpa
204.31.217.in-addr.arpa
205.31.217.in-addr.arpa
206.29.193.in-addr.arpa
206.31.217.in-addr.arpa
207.31.217.in-addr.arpa
47.17.193.in-addr.arpa
cz
cznic.org
dns-tester.cz
dnssec-tester.cz
dnssec.cz
dnstester.cz
nic.cz
signed.dnstester.cz
domains using this as nameserver under another name
xn--hkyrky-ptac70bc.cz