Apex domains cannot have CNAME records.
Question and response
Question
dig assentcompliance.com. NS
Answer
assentcompliance.com. 2 NS ns-1124.awsdns-12.org.
assentcompliance.com. 2 NS ns-1600.awsdns-08.co.uk.
assentcompliance.com. 2 NS ns-381.awsdns-47.com.
assentcompliance.com. 2 NS ns-650.awsdns-17.net.
Authority
The response has no authority records.
Additional
ns-650.awsdns-17.net. 2 A 205.251.194.138
ns-1124.awsdns-12.org. 2 A 205.251.196.100
ns-1600.awsdns-08.co.uk. 2 A 205.251.198.64
ns-381.awsdns-47.com. 2 AAAA 2600:9000:5301:7d00:0:0:0:1
ns-650.awsdns-17.net. 2 AAAA 2600:9000:5302:8a00:0:0:0:1
ns-1124.awsdns-12.org. 2 AAAA 2600:9000:5304:6400:0:0:0:1
ns-1600.awsdns-08.co.uk. 2 AAAA 2600:9000:5306:4000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0