Apex domains cannot have CNAME records.
Question and response
Question
dig fixed.one.hu. NS
Answer
fixed.one.hu. 5 NS bbns01.infraco.hu.
fixed.one.hu. 5 NS bbns02.infraco.hu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0