Apex domains cannot have CNAME records.
Question and response
Question
dig nuspire.com. NS
Answer
nuspire.com. 2 NS ns-1565.awsdns-03.co.uk.
nuspire.com. 2 NS ns-1239.awsdns-26.org.
nuspire.com. 2 NS ns-383.awsdns-47.com.
nuspire.com. 2 NS ns-1006.awsdns-61.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0