coverage.scientificbonus.net has no CNAME records.
Question and response
Question
dig coverage.scientificbonus.net. NS
Answer
The response has no answer records.
Authority
scientificbonus.net. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1772005710 43200 3600 604800 3601
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0