Apex domains cannot have CNAME records.
Question and response
Question
dig machinewinkel.com. NS
Answer
machinewinkel.com. 5 NS ns-520.awsdns-01.net.
machinewinkel.com. 5 NS ns-2045.awsdns-63.co.uk.
machinewinkel.com. 5 NS ns-243.awsdns-30.com.
machinewinkel.com. 5 NS ns-1448.awsdns-53.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0