Apex domains cannot have CNAME records.
Question and response
Question
dig auroradns.nl. NS
Answer
auroradns.nl. 5 NS ns051.auroradns.eu.
auroradns.nl. 5 NS ns053.auroradns.info.
auroradns.nl. 5 NS ns052.auroradns.nl.
Authority
The response has no authority records.
Additional
ns052.auroradns.nl. 5 A 31.25.98.35
ns052.auroradns.nl. 5 AAAA 2a05:1500:702:0:1c00:a2ff:fe00:1f
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0