Apex domains cannot have CNAME records.
Question and response
Question
dig artacom.it. NS
Answer
artacom.it. 1 NS ns-1312.awsdns-36.org.
artacom.it. 1 NS ns-911.awsdns-49.net.
artacom.it. 1 NS ns-387.awsdns-48.com.
artacom.it. 1 NS ns-2025.awsdns-61.co.uk.
Authority
The response has no authority records.
Additional
ns-387.awsdns-48.com. 2 A 205.251.193.131
ns-911.awsdns-49.net. 2 A 205.251.195.143
ns-1312.awsdns-36.org. 2 A 205.251.197.32
ns-2025.awsdns-61.co.uk. 2 A 205.251.199.233
ns-387.awsdns-48.com. 2 AAAA 2600:9000:5301:8300:0:0:0:1
ns-911.awsdns-49.net. 2 AAAA 2600:9000:5303:8f00:0:0:0:1
ns-1312.awsdns-36.org. 2 AAAA 2600:9000:5305:2000:0:0:0:1
ns-2025.awsdns-61.co.uk. 2 AAAA 2600:9000:5307:e900:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0