Apex domains cannot have CNAME records.
Question and response
Question
dig octia.org. NS
Answer
octia.org. 5 NS ns1.octia.org.
octia.org. 5 NS ns2.octia.org.
Authority
The response has no authority records.
Additional
ns1.octia.org. 5 A 95.214.52.152
ns2.octia.org. 5 A 91.223.3.253
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0