Apex domains cannot have CNAME records.
Question and response
Question
dig actonsoftware.com. NS
Answer
actonsoftware.com. 5 NS ns-163.awsdns-20.com.
actonsoftware.com. 5 NS ns-650.awsdns-17.net.
actonsoftware.com. 5 NS ns-1205.awsdns-22.org.
actonsoftware.com. 5 NS ns-1973.awsdns-54.co.uk.
Authority
The response has no authority records.
Additional
ns-650.awsdns-17.net. 2 A 205.251.194.138
ns-1205.awsdns-22.org. 2 A 205.251.196.181
ns-1973.awsdns-54.co.uk. 2 A 205.251.199.181
ns-163.awsdns-20.com. 2 AAAA 2600:9000:5300:a300:0:0:0:1
ns-650.awsdns-17.net. 2 AAAA 2600:9000:5302:8a00:0:0:0:1
ns-1205.awsdns-22.org. 2 AAAA 2600:9000:5304:b500:0:0:0:1
ns-1973.awsdns-54.co.uk. 2 AAAA 2600:9000:5307:b500:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0