Apex domains cannot have CNAME records.
Question and response
Question
dig exwire.com. NS
Answer
exwire.com. 4 NS ns-183.awsdns-22.com.
exwire.com. 4 NS ns-889.awsdns-47.net.
exwire.com. 4 NS ns-1416.awsdns-49.org.
exwire.com. 4 NS ns-1615.awsdns-09.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0