Apex domains cannot have CNAME records.
Question and response
Question
dig superredes.net. NS
Answer
superredes.net. 5 NS ns-1199.awsdns-21.org.
superredes.net. 5 NS ns-857.awsdns-43.net.
superredes.net. 5 NS ns-358.awsdns-44.com.
superredes.net. 5 NS ns-1861.awsdns-40.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0