Apex domains cannot have CNAME records.
Question and response
Question
dig ec21hosting.com. NS
Answer
ec21hosting.com. 5 NS ns2.namesvr.net.
ec21hosting.com. 5 NS ns1.namesvr.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0