Apex domains cannot have CNAME records.
Question and response
Question
dig xyloventix.com. NS
Answer
xyloventix.com. 5 NS ns-248.awsdns-31.com.
xyloventix.com. 5 NS ns-1618.awsdns-10.co.uk.
xyloventix.com. 5 NS ns-1512.awsdns-61.org.
xyloventix.com. 5 NS ns-921.awsdns-51.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0