Apex domains cannot have CNAME records.
Question and response
Question
dig view21.net. NS
Answer
view21.net. 5 NS ns-1144.awsdns-15.org.
view21.net. 5 NS ns-1957.awsdns-52.co.uk.
view21.net. 5 NS ns-419.awsdns-52.com.
view21.net. 5 NS ns-947.awsdns-54.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0