Apex domains cannot have CNAME records.
Question and response
Question
dig bandirmadup.org. NS
Answer
bandirmadup.org. 5 NS ns-1990.awsdns-56.co.uk.
bandirmadup.org. 5 NS ns-1751.awsdns-26.co.uk.
bandirmadup.org. 5 NS ns-292.awsdns-36.com.
bandirmadup.org. 5 NS ns-1351.awsdns-40.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0