Apex domains cannot have CNAME records.
Question and response
Question
dig ttasia.net. NS
Answer
ttasia.net. 5 NS ns-1571.awsdns-04.co.uk.
ttasia.net. 5 NS ns-398.awsdns-49.com.
ttasia.net. 5 NS ns-645.awsdns-16.net.
ttasia.net. 5 NS ns-1083.awsdns-07.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0