Apex domains cannot have CNAME records.
Question and response
Question
dig stibee.com. NS
Answer
stibee.com. 5 NS ns-1151.awsdns-15.org.
stibee.com. 5 NS ns-1656.awsdns-15.co.uk.
stibee.com. 5 NS ns-307.awsdns-38.com.
stibee.com. 5 NS ns-785.awsdns-34.net.
Authority
The response has no authority records.
Additional
ns-785.awsdns-34.net. 1 A 205.251.195.17
ns-1151.awsdns-15.org. 1 A 205.251.196.127
ns-1656.awsdns-15.co.uk. 1 A 205.251.198.120
ns-307.awsdns-38.com. 1 AAAA 2600:9000:5301:3300:0:0:0:1
ns-785.awsdns-34.net. 1 AAAA 2600:9000:5303:1100:0:0:0:1
ns-1151.awsdns-15.org. 1 AAAA 2600:9000:5304:7f00:0:0:0:1
ns-1656.awsdns-15.co.uk. 1 AAAA 2600:9000:5306:7800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0