Apex domains cannot have CNAME records.
Question and response
Question
dig scanscope.net. NS
Answer
scanscope.net. 5 NS ns-922.awsdns-51.net.
scanscope.net. 5 NS ns-1143.awsdns-14.org.
scanscope.net. 5 NS ns-2015.awsdns-59.co.uk.
scanscope.net. 5 NS ns-27.awsdns-03.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0