Apex domains cannot have CNAME records.
Question and response
Question
dig acetelecom.hu. NS
Answer
acetelecom.hu. 5 NS pdns1.acetelecom.hu.
acetelecom.hu. 5 NS pdns2.acetelecom.hu.
Authority
The response has no authority records.
Additional
pdns1.acetelecom.hu. 5 A 109.74.48.48
pdns2.acetelecom.hu. 5 A 195.70.36.169
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0