Apex domains cannot have CNAME records.
Question and response
Question
dig ownregistrar.com. NS
Answer
ownregistrar.com. 5 NS ns-110.awsdns-13.com.
ownregistrar.com. 5 NS ns-1035.awsdns-01.org.
ownregistrar.com. 5 NS ns-732.awsdns-27.net.
ownregistrar.com. 5 NS ns-1832.awsdns-37.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0