Apex domains cannot have CNAME records.
Question and response
Question
dig dataweb.net. NS
Answer
dataweb.net. 5 NS ns0.dataweb.nl.
dataweb.net. 5 NS ns2.dataweb.nl.
Authority
The response has no authority records.
Additional
ns0.dataweb.nl. 5 A 87.236.0.106
ns2.dataweb.nl. 5 A 188.92.62.62
ns0.dataweb.nl. 5 AAAA 2a00:a000:0:1:87:236:0:106
ns2.dataweb.nl. 5 AAAA 2a00:a000:0:1:188:92:62:62
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0