Apex domains cannot have CNAME records.
Question and response
Question
dig kyberio-dns.com. NS
Answer
kyberio-dns.com. 5 NS gns02.edge-dns.com.
kyberio-dns.com. 5 NS gns01.edge-dns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0