dns-b2.cronon.de has no CNAME records.
Question and response
Question
dig dns-b2.cronon.de. NS
Answer
The response has no answer records.
Authority
cronon.de. 10800 SOA dns-b1.cronon.de. postmaster.cronon.de. 2025012100 43200 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0