ldap.dbk.dk has no CNAME records.
Question and response
Question
dig ldap.dbk.dk. NS
Answer
The response has no answer records.
Authority
dbk.dk. 9 SOA ns.dandomain.dk. hostmaster.dandomain.dk. 2025100701 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0