ns.link-m.de has no CNAME records.
Question and response
Question
dig ns.link-m.de. NS
Answer
The response has no answer records.
Authority
link-m.de. 3600 SOA ns.link-m.de. hostmaster.link-m.de. 2026020207 28800 3600 864000 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0