Apex domains cannot have CNAME records.
Question and response
Question
dig dravanet.net. NS
Answer
dravanet.net. 4 NS drava.dravanet.hu.
dravanet.net. 4 NS ns2.dravanet.hu.
Authority
The response has no authority records.
Additional
ns2.dravanet.hu. 1 A 109.61.11.24
drava.dravanet.hu. 1 A 109.61.69.1
ns2.dravanet.hu. 1 AAAA 2a01:be00:0:b:35:0:b:18
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0