srv02.spectre-net.de has no CNAME records.
Question and response
Question
dig srv02.spectre-net.de. NS
Answer
The response has no answer records.
Authority
spectre-net.de. 3600 SOA ns01.spectre-net.de. hostmaster.spectre-net.de. 2026022301 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0