Apex domains cannot have CNAME records.
Question and response
Question
dig hiroponstar.com. NS
Answer
hiroponstar.com. 5 NS ns-28.awsdns-03.com.
hiroponstar.com. 5 NS ns-1441.awsdns-52.org.
hiroponstar.com. 5 NS ns-405.awsdns-50.com.
hiroponstar.com. 5 NS ns-334.awsdns-41.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0