Apex domains cannot have CNAME records.
Question and response
Question
dig yourfilter.nl. NS
Answer
yourfilter.nl. 5 NS ns112.auroradns.nl.
yourfilter.nl. 5 NS ns111.auroradns.eu.
yourfilter.nl. 5 NS ns113.auroradns.info.
Authority
The response has no authority records.
Additional
ns113.auroradns.info. 5 A 195.8.208.30
ns113.auroradns.info. 5 AAAA 2a05:1500:fe00:0:0:c3ff:fe08:d01e
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0