go
ns3.domain-registry.nl has one IP number , which also has a corresponding reverse pointer. e.ext.nic.fr point to the same IP. aw, enum.nl, nlnet.nl, tednet.nl, nlnetlabs.nl and at least one other host use this as a nameserver. domain-registry.nl is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for domain-registry.nl is handled by one mailserver at domain-registry.nl themselves. ns3.domain-registry.nl is hosted on a server in Netherlands.

ns3.domain-registry.nl
a records
 
+ 193.176.144.6 193.176.144.0/24 AS1140 e.ext.nic.fr
+ --- e.ext.nic.fr
+ --- -

domain-registry.nl
ns-soa records
ns1.sidn.nl
+ 94.198.152.68 94.198.152.0/21 AS1140 -
+ --- -
ns records
ns1.sidn.nl
+ 94.198.152.68 94.198.152.0/21 AS1140 -
+ --- -
ns2.sidn.nl
+ 194.171.17.5 194.171.0.0/16 AS1103 -
ns1.surfnet.nl
+ 192.87.106.101 192.87.0.0/16 AS1103 -
ns.nl.net
+ 193.78.240.1 193.78.0.0/15 AS702 -
mx records
mail.domain-registry.nl
+ 94.198.154.137 94.198.152.0/21 AS1140 -
+ --- -
ip numbers of host
193.176.144.6
ptrs of ip numbers
e.ext.nic.fr
ns3.domain-registry.nl
ip numbers using ptr to this host
193.176.144.6
hostnames sharing ip with a-records
e.ext.nic.fr
domains using this as nameserver
1.3.e164.arpa
aw
enum.nl
nlnet.nl
nlnetlabs.nl
tednet.nl
domains using this as nameserver under another name
fr
pm
re
tf
wf
yt