Apex domains cannot have CNAME records.
Question and response
Question
dig irds.it. NS
Answer
irds.it. 5 NS ns2.kpnqwest.it.
irds.it. 5 NS ns.kpnqwest.it.
Authority
The response has no authority records.
Additional
ns.kpnqwest.it. 5 A 212.97.32.3
ns2.kpnqwest.it. 5 A 94.141.24.93
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0