Apex domains cannot have CNAME records.
Question and response
Question
dig atipongmotor.com. NS
Answer
atipongmotor.com. 1 NS ns-105.awsdns-13.com.
atipongmotor.com. 1 NS ns-1171.awsdns-18.org.
atipongmotor.com. 1 NS ns-1506.awsdns-60.org.
atipongmotor.com. 1 NS ns-1657.awsdns-15.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0