Apex domains cannot have CNAME records.
Question and response
Question
dig bilanpsy.org. NS
Answer
bilanpsy.org. 3 NS ns-495.awsdns-61.com.
bilanpsy.org. 3 NS ns-386.awsdns-48.com.
bilanpsy.org. 3 NS ns-1971.awsdns-54.co.uk.
bilanpsy.org. 3 NS ns-1699.awsdns-20.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0