Apex domains cannot have CNAME records.
Question and response
Question
dig intratel.nl. NS
Answer
intratel.nl. 5 NS ns24.gakijken.nl.
intratel.nl. 5 NS ns3.gakijken.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0