Apex domains cannot have CNAME records.
Question and response
Question
dig systemna.com. NS
Answer
systemna.com. 1 NS ns1.144-76-219-202.cprapid.com.
systemna.com. 1 NS ns2.144-76-219-202.cprapid.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0