Apex domains cannot have CNAME records.
Question and response
Question
dig hj6666.org. NS
Answer
hj6666.org. 5 NS ns-1047.awsdns-02.org.
hj6666.org. 5 NS ns-1082.awsdns-07.org.
hj6666.org. 5 NS ns-1580.awsdns-05.co.uk.
hj6666.org. 5 NS ns-417.awsdns-52.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0