c.nic.dk has no CNAME records.
Question and response
Question
dig c.nic.dk. NS
Answer
The response has no answer records.
Authority
nic.dk. 600 SOA b.nic.dk. tech.punktum.dk. 2026022400 14400 3600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0