Apex domains cannot have CNAME records.
Question and response
Question
dig vornexira.org. NS
Answer
vornexira.org. 4 NS ns-367.awsdns-45.com.
vornexira.org. 4 NS ns-1880.awsdns-43.co.uk.
vornexira.org. 4 NS ns-1574.awsdns-04.co.uk.
vornexira.org. 4 NS ns-1137.awsdns-14.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0