Apex domains cannot have CNAME records.
Question and response
Question
dig mcx.nl. NS
Answer
mcx.nl. 5 NS ns2.mcx.nl.
mcx.nl. 5 NS ns3.mcx.nl.
mcx.nl. 5 NS ns4.mcx.nl.
mcx.nl. 5 NS ns1.mcx.nl.
Authority
The response has no authority records.
Additional
ns1.mcx.nl. 5 A 87.251.38.142
ns2.mcx.nl. 5 A 144.178.102.155
ns3.mcx.nl. 5 A 87.195.18.75
ns4.mcx.nl. 5 A 193.247.199.11
ns1.mcx.nl. 5 AAAA 2001:7b8:62c:1:0:0:0:3
ns2.mcx.nl. 5 AAAA 2a02:fe9:a98:212:0:0:0:21
ns3.mcx.nl. 5 AAAA 2001:9e0:813:2:0:0:0:2
ns4.mcx.nl. 5 AAAA 2a05:b2c4:0:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0