Apex domains cannot have CNAME records.
Question and response
Question
dig zucchetti.com. NS
Answer
zucchetti.com. 5 NS ns1.zucchetti.com.
zucchetti.com. 5 NS ns2.zucchetti.com.
Authority
The response has no authority records.
Additional
ns1.zucchetti.com. 5 A 62.108.227.2
ns2.zucchetti.com. 5 A 92.119.225.200
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0