Apex domains cannot have CNAME records.
Question and response
Question
dig hyd.nl. NS
Answer
hyd.nl. 4 NS courtney.ns.cloudflare.com.
hyd.nl. 4 NS vick.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0