Apex domains cannot have CNAME records.
Question and response
Question
dig pankratoff.com. NS
Answer
pankratoff.com. 5 NS ns-870.awsdns-44.net.
pankratoff.com. 5 NS ns-1271.awsdns-30.org.
pankratoff.com. 5 NS ns-1392.awsdns-46.org.
pankratoff.com. 5 NS ns-1747.awsdns-26.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0