Apex domains cannot have CNAME records.
Question and response
Question
dig idcservices.it. NS
Answer
idcservices.it. 5 NS ns3a.idcservices.it.
idcservices.it. 5 NS ns4a.idcservices.it.
idcservices.it. 5 NS ns1a.idcservices.it.
idcservices.it. 5 NS ns2a.idcservices.it.
Authority
The response has no authority records.
Additional
ns1a.idcservices.it. 5 A 217.220.57.131
ns2a.idcservices.it. 5 A 213.92.100.3
ns3a.idcservices.it. 5 A 194.20.8.4
ns4a.idcservices.it. 5 A 194.20.8.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0