Apex domains cannot have CNAME records.
Question and response
Question
dig lisbv.nl. NS
Answer
lisbv.nl. 5 NS ns2.namespace4you.de.
lisbv.nl. 5 NS ns.namespace4you.de.
lisbv.nl. 5 NS rz-ns-01.winsped.de.
lisbv.nl. 5 NS slv2.1und1.de.
Authority
The response has no authority records.
Additional
rz-ns-01.winsped.de. 5 A 195.16.75.241
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0