Apex domains cannot have CNAME records.
Question and response
Question
dig hellosign.com. NS
Answer
hellosign.com. 5 NS ns-830.awsdns-39.net.
hellosign.com. 5 NS ns-1734.awsdns-24.co.uk.
hellosign.com. 5 NS ns-62.awsdns-07.com.
hellosign.com. 5 NS ns-1479.awsdns-56.org.
Authority
The response has no authority records.
Additional
ns-830.awsdns-39.net. 4 A 205.251.195.62
ns-1479.awsdns-56.org. 4 A 205.251.197.199
ns-1734.awsdns-24.co.uk. 4 A 205.251.198.198
ns-62.awsdns-07.com. 4 AAAA 2600:9000:5300:3e00:0:0:0:1
ns-830.awsdns-39.net. 4 AAAA 2600:9000:5303:3e00:0:0:0:1
ns-1479.awsdns-56.org. 4 AAAA 2600:9000:5305:c700:0:0:0:1
ns-1734.awsdns-24.co.uk. 4 AAAA 2600:9000:5306:c600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0