Apex domains cannot have CNAME records.
Question and response
Question
dig denit.net. NS
Answer
denit.net. 5 NS ns1.masterdns.nl.
denit.net. 5 NS ns2.masterdns.nl.
Authority
The response has no authority records.
Additional
ns1.masterdns.nl. 5 A 185.168.85.11
ns2.masterdns.nl. 5 A 185.168.85.12
ns1.masterdns.nl. 5 AAAA 2a0a:9fc0:1053:0:0:0:0:11
ns2.masterdns.nl. 5 AAAA 2a0a:9fc0:1053:0:0:0:0:12
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0