Apex domains cannot have CNAME records.
Question and response
Question
dig acilucca.it. NS
Answer
acilucca.it. 5 NS ns82.domaincontrol.com.
acilucca.it. 5 NS ns81.domaincontrol.com.
Authority
The response has no authority records.
Additional
ns81.domaincontrol.com. 5 A 97.74.101.32
ns82.domaincontrol.com. 5 A 173.201.69.32
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0