go
c.nic.dk point to 198.173.5.4.

c.nic.dk
a records
 
+ 198.173.5.4 198.173.5.0/24 AS14585 -
+ --- -
ip numbers of host
198.173.5.4
ptrs of ip numbers
c.nic.dk
hostnames sharing ip with a-records
c.nic.dk
domains using this as nameserver
dk
nic.dk