Apex domains cannot have CNAME records.
Question and response
Question
dig connesi.it. NS
Answer
connesi.it. 5 NS authdns.connesi.it.
connesi.it. 5 NS authdns2.connesi.it.
Authority
The response has no authority records.
Additional
authdns.connesi.it. 5 A 109.73.81.70
authdns2.connesi.it. 5 A 37.77.98.70
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0