go
ns1.nic.es has one IP number , which also has a corresponding reverse pointer. es, cat, nic.es, isig.es, esnic.es and at least four other hosts use this as a nameserver. nic.es is a domain controlled by five nameservers. Two of them are on the same IP network. Incoming mail for nic.es is handled by two mailservers at red.es. They are on different IP networks. nic.es has one IP number. ns1.nic.es is hosted on a server in Spain.

ns1.nic.es
a records
 
+ 194.69.254.1 194.69.254.0/24 AS15734 -
+ --- -

nic.es
a records
 
+ 194.69.254.54 194.69.254.0/24 AS15734  
+ ---  
ns-soa records
ns1.nic.es
+ 194.69.254.1 194.69.254.0/24 AS15734 -
+ --- -
ns records
ns1.nic.es
+ 194.69.254.1 194.69.254.0/24 AS15734 -
+ --- -
ns2.nic.es
+ 193.146.142.168 193.144.0.0/14 AS766  
+ ---  
sns-pb.isc.org
+ 192.5.4.1 192.5.4.0/24 AS3557 -
+ --- -
nso.nic.es
+ 194.69.254.2 194.69.254.0/24 AS15734 ineco.nic.es
+ --- ineco.nic.es
ns1.crn.nic.es
+ 195.81.201.11 195.81.0.0/16 AS8928  
+ ---  
mx records
correo-bak.red.es
+ 193.146.142.168 193.144.0.0/14 AS766  
+ ---  
correo.red.es
+ 194.69.254.60 194.69.254.0/24 AS15734 -
+ --- -
ip numbers of host
194.69.254.1
ptrs of ip numbers
ns1.nic.es
ip numbers using ptr to this host
194.69.254.1
domains using this as nameserver
254.69.194.in-addr.arpa
cat
dominios.es
es
es-nic.es
esnic.es
isig.es
nic.es
todos.com
used as nameserver but missing in parent delegation
dominios.es
es-nic.es
esnic.es
isig.es
used as nameserver but missing in zone
todos.com