static.251.80.109.65.clients.your-server.de has no CNAME records.
Question and response
Question
dig static.251.80.109.65.clients.your-server.de. NS
Answer
The response has no answer records.
Authority
80.109.65.clients.your-server.de. 144 SOA ns1.your-server.de. dns.hetzner.com. 2021062418 14400 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0