Apex domains cannot have CNAME records.
Question and response
Question
dig byway.it. NS
Answer
byway.it. 5 NS ns-756.awsdns-30.net.
byway.it. 5 NS ns-1051.awsdns-03.org.
byway.it. 5 NS ns-1877.awsdns-42.co.uk.
byway.it. 5 NS ns-115.awsdns-14.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0