Apex domains cannot have CNAME records.
Question and response
Question
dig weserve.nl. NS
Answer
weserve.nl. 5 NS ns2.weservecluster.eu.
weserve.nl. 5 NS ns1.weservecluster.eu.
Authority
The response has no authority records.
Additional
ns1.weservecluster.eu. 5 A 77.222.85.221
ns2.weservecluster.eu. 5 A 37.97.206.123
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0