Apex domains cannot have CNAME records.
Question and response
Question
dig vodafone.hu. NS
Answer
vodafone.hu. 5 NS ns3.vodafone.hu.
vodafone.hu. 5 NS ns.vodafone.hu.
Authority
The response has no authority records.
Additional
ns.vodafone.hu. 5 A 80.244.96.1
ns3.vodafone.hu. 5 A 80.244.97.43
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0