Apex domains cannot have CNAME records.
Question and response
Question
dig rwasphost.com. NS
Answer
rwasphost.com. 5 NS dns1.rwasphost.com.
rwasphost.com. 5 NS dns2.rwasphost.com.
Authority
The response has no authority records.
Additional
dns1.rwasphost.com. 5 A 172.172.216.21
dns2.rwasphost.com. 5 A 18.219.104.163
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0