Apex domains cannot have CNAME records.
Question and response
Question
dig impresasemplice.it. NS
Answer
impresasemplice.it. 5 NS dns9.interbusiness.it.
impresasemplice.it. 5 NS dns10.interbusiness.it.
Authority
The response has no authority records.
Additional
dns9.interbusiness.it. 5 A 80.22.52.133
dns10.interbusiness.it. 5 A 217.169.119.68
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0