Apex domains cannot have CNAME records.
Question and response
Question
dig artinfini.com. NS
Answer
artinfini.com. 5 NS ns1.artinfini.com.
artinfini.com. 5 NS ns2.artinfini.com.
Authority
The response has no authority records.
Additional
ns1.artinfini.com. 5 A 213.32.17.67
ns2.artinfini.com. 5 A 208.115.210.162
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0