Apex domains cannot have CNAME records.
Question and response
Question
dig pvenezia.com. NS
Answer
pvenezia.com. 5 NS ns2.pvenezia.com.
pvenezia.com. 5 NS ns1.pvenezia.com.
Authority
The response has no authority records.
Additional
ns1.pvenezia.com. 5 A 24.105.167.14
ns2.pvenezia.com. 5 A 174.138.39.44
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0