ru.vjm.dk has no CNAME records.
Question and response
Question
dig ru.vjm.dk. NS
Answer
The response has no answer records.
Authority
vjm.dk. 176 SOA ns1.123hotel.dk. hostmaster.curanet.dk. 2026030502 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0