Apex domains cannot have CNAME records.
Question and response
Question
dig ascenty.com. NS
Answer
ascenty.com. 1 NS ns-1597.awsdns-07.co.uk.
ascenty.com. 1 NS ns-83.awsdns-10.com.
ascenty.com. 1 NS ns-759.awsdns-30.net.
ascenty.com. 1 NS ns-1310.awsdns-35.org.
Authority
The response has no authority records.
Additional
ns-759.awsdns-30.net. 1 A 205.251.194.247
ns-1310.awsdns-35.org. 1 A 205.251.197.30
ns-1597.awsdns-07.co.uk. 1 A 205.251.198.61
ns-759.awsdns-30.net. 1 AAAA 2600:9000:5302:f700:0:0:0:1
ns-1310.awsdns-35.org. 1 AAAA 2600:9000:5305:1e00:0:0:0:1
ns-1597.awsdns-07.co.uk. 1 AAAA 2600:9000:5306:3d00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0