Apex domains cannot have CNAME records.
Question and response
Question
dig apronix.net. NS
Answer
apronix.net. 5 NS dns1w.brunner.at.
apronix.net. 5 NS dns3.proserver1.at.
apronix.net. 5 NS dns2w.brunner.at.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0