Apex domains cannot have CNAME records.
Question and response
Question
dig anniskarpenko.com. NS
Answer
anniskarpenko.com. 4 NS ns-2045.awsdns-63.co.uk.
anniskarpenko.com. 4 NS ns-960.awsdns-56.net.
anniskarpenko.com. 4 NS ns-222.awsdns-27.com.
anniskarpenko.com. 4 NS ns-672.awsdns-20.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0