Apex domains cannot have CNAME records.
Question and response
Question
dig c.xinspire.com. NS
Answer
c.xinspire.com. 5 NS ns-750.awsdns-29.net.
c.xinspire.com. 5 NS ns-1070.awsdns-05.org.
c.xinspire.com. 5 NS ns-1939.awsdns-50.co.uk.
c.xinspire.com. 5 NS ns-335.awsdns-41.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0