Apex domains cannot have CNAME records.
Question and response
Question
dig sailwhisper.com. NS
Answer
sailwhisper.com. 5 NS ns-375.awsdns-46.com.
sailwhisper.com. 5 NS ns-548.awsdns-04.net.
sailwhisper.com. 5 NS ns-547.awsdns-04.net.
sailwhisper.com. 5 NS ns-642.awsdns-16.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0