Apex domains cannot have CNAME records.
Question and response
Question
dig artgomsh.com. NS
Answer
artgomsh.com. 5 NS ns-645.awsdns-16.net.
artgomsh.com. 5 NS ns-2019.awsdns-60.co.uk.
artgomsh.com. 5 NS ns-1710.awsdns-21.co.uk.
artgomsh.com. 5 NS ns-1252.awsdns-28.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0