go
ns1.crn.nic.es point to 195.81.201.11.

ns1.crn.nic.es
a records
 
+ 195.81.201.11 195.81.0.0/16 AS8928  
+ ---  
ip numbers of host
195.81.201.11
hostnames sharing ip with a-records
ns1.crn.nic.es
domains using this as nameserver
dominios.es
es
es-nic.es
esnic.es
nic.es