dns.stefanux.net has no CNAME records.
Question and response
Question
dig dns.stefanux.net. NS
Answer
The response has no answer records.
Authority
stefanux.net. 1861 SOA ns.inwx.de. hostmaster.inwx.de. 2025071701 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0