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c.nic.dk has one IP number , which also has a corresponding reverse pointer. dk and nic.dk use this as a nameserver. nic.dk is a domain controlled by seven nameservers. Two of them are on the same IP network. Incoming mail for nic.dk is handled by one mailserver at dk-hostmaster.dk. nic.dk has one IP number. c.nic.dk is hosted on a server in United States even though the hostname implies Denmark.

c.nic.dk
a records
 
+ 198.173.5.4 198.173.5.0/24 AS14585 -
+ --- -

nic.dk
a records
 
+ 193.163.102.23 193.163.102.0/24 AS39839  
+ ---  
ns-soa records
auth01.ns.dk-hostmaster.dk
+ 193.163.102.11 193.163.102.0/24 AS39839 -
+ --- -
ns records
b.nic.dk
+ 193.163.102.222 193.163.102.0/24 AS39839 -
+ --- -
c.nic.dk
+ 198.173.5.4 198.173.5.0/24 AS14585 -
l.nic.dk
+ 192.38.7.242 192.38.0.0/17 AS1835 -
s.nic.dk
+ 77.72.229.252 77.72.224.0/21 AS8674 -
auth01.ns.dk-hostmaster.dk
+ 193.163.102.11 193.163.102.0/24 AS39839 -
auth02.ns.dk-hostmaster.dk
+ 193.238.184.112 193.238.184.0/22 AS34848 -
p.nic.dk
+ 204.61.216.36 204.61.216.0/23 AS42 -
mx records
music.dk-hostmaster.dk
+ 193.163.102.2 193.163.102.0/24 AS39839 dmz-b.nic.dk
+ --- dmz-b.nic.dk
ip numbers of host
198.173.5.4
ptrs of ip numbers
c.nic.dk
ip numbers using ptr to this host
198.173.5.4
domains using this as nameserver
dk
nic.dk