Apex domains cannot have CNAME records.
Question and response
Question
dig adriatv.net. NS
Answer
adriatv.net. 5 NS ns-231.awsdns-28.com.
adriatv.net. 5 NS ns-295.awsdns-36.com.
adriatv.net. 5 NS ns-1687.awsdns-18.co.uk.
adriatv.net. 5 NS ns-1998.awsdns-57.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0