Apex domains cannot have CNAME records.
Question and response
Question
dig integral.net. NS
Answer
integral.net. 5 NS ns-1631.awsdns-11.co.uk.
integral.net. 5 NS ns-1208.awsdns-23.org.
integral.net. 5 NS ns-436.awsdns-54.com.
integral.net. 5 NS ns-542.awsdns-03.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0