Apex domains cannot have CNAME records.
Question and response
Question
dig reverse.hu. NS
Answer
reverse.hu. 5 NS dns2.hu.
reverse.hu. 5 NS dns1.hu.
reverse.hu. 5 NS dns3.hu.
Authority
The response has no authority records.
Additional
dns1.hu. 5 A 212.52.165.53
dns2.hu. 5 A 194.149.0.68
dns3.hu. 5 A 94.199.49.123
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0