Apex domains cannot have CNAME records.
Question and response
Question
dig one.hu. NS
Answer
one.hu. 5 NS ns2.one.hu.
one.hu. 5 NS ns1.one.hu.
Authority
The response has no authority records.
Additional
ns1.one.hu. 5 A 80.244.96.1
ns2.one.hu. 5 A 80.244.97.43
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0