Apex domains cannot have CNAME records.
Question and response
Question
dig intred.it. NS
Answer
intred.it. 5 NS dns1.intred.it.
intred.it. 5 NS dns2.intred.it.
Authority
The response has no authority records.
Additional
dns1.intred.it. 5 A 62.97.32.21
dns2.intred.it. 5 A 62.97.33.21
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0