go
n3ns.nic.es has one IP number. hr, edu.es, org.es, gob.es, nom.es and at least one other host use this as a nameserver. nic.es is delegated to three nameservers, however two extra nameservers are listed in the zone. 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. n3ns.nic.es is hosted on a server in Spain.

n3ns.nic.es
a records
 
+ 194.69.254.42 194.69.254.0/24 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
194.69.254.42
domains using this as nameserver
com.es
edu.es
gob.es
hr
nom.es
org.es
nameservers missing in parent delegation
ns1.crn.nic.es
sns-pb.isc.org