www.cyberfun.de has no CNAME records.
Question and response
Question
dig www.cyberfun.de. NS
Answer
The response has no answer records.
Authority
cyberfun.de. 5372 SOA ns1.sdt.net. hostmaster.sdt.net. 2023042501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0