net-bbone.checon.net has no CNAME records.
Question and response
Question
dig net-bbone.checon.net. NS
Answer
The response has no answer records.
Authority
checon.net. 3853 SOA ns.checon.net. hostmaster.checon.de. 2025071101 28800 3600 864000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0