Apex domains cannot have CNAME records.
Question and response
Question
dig m3szerviz.hu. NS
Answer
m3szerviz.hu. 5 NS ns10.kn1.eu.
m3szerviz.hu. 5 NS ns11.kn1.eu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0