ntp01.dfuchshuber.de has no CNAME records.
Question and response
Question
dig ntp01.dfuchshuber.de. NS
Answer
The response has no answer records.
Authority
dfuchshuber.de. 300 SOA dns102.ovh.net. tech.ovh.net. 2026022501 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0