Apex domains cannot have CNAME records.
Question and response
Question
dig IT.net. NS
Answer
IT.net. 2 NS dns2.it.net.
IT.net. 2 NS ns102.reevodns.eu.
IT.net. 2 NS dns.it.net.
IT.net. 2 NS ns101.reevodns.it.
Authority
The response has no authority records.
Additional
dns.IT.net. 2 A 46.37.17.33
dns2.IT.net. 2 A 51.195.116.189
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0