6.nocabal.de has no CNAME records.
Question and response
Question
dig 6.nocabal.de. NS
Answer
The response has no answer records.
Authority
nocabal.de. 293 SOA x.ns.joker.com. hostmaster.joker.com. 2022030575 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0