Apex domains cannot have CNAME records.
Question and response
Question
dig divxcodec-advice.org. NS
Answer
divxcodec-advice.org. 1 NS ns-122.awsdns-15.com.
divxcodec-advice.org. 1 NS ns-1329.awsdns-38.org.
divxcodec-advice.org. 1 NS ns-1525.awsdns-62.org.
divxcodec-advice.org. 1 NS ns-1827.awsdns-36.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0