Apex domains cannot have CNAME records.
Question and response
Question
dig nexthost.nl. NS
Answer
nexthost.nl. 5 NS ns01.nexthost.nl.
nexthost.nl. 5 NS ns02.nexthost.eu.
nexthost.nl. 5 NS ns03.nexthost.nl.
Authority
The response has no authority records.
Additional
ns01.nexthost.nl. 5 A 185.138.80.142
ns02.nexthost.eu. 5 A 45.153.84.16
ns02.nexthost.eu. 5 A 217.26.119.170
ns03.nexthost.nl. 5 A 217.26.119.170
ns01.nexthost.nl. 5 AAAA 2a00:1ac1:812:0:185:138:80:1420
ns03.nexthost.nl. 5 AAAA 2a00:1ac0:1104:0:217:26:119:1700
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0