Apex domains cannot have CNAME records.
Question and response
Question
dig wihn.net. NS
Answer
wihn.net. 5 NS ns-34.awsdns-04.com.
wihn.net. 5 NS ns-757.awsdns-30.net.
wihn.net. 5 NS ns-1689.awsdns-19.co.uk.
wihn.net. 5 NS ns-1742.awsdns-25.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0