Apex domains cannot have CNAME records.
Question and response
Question
dig marnet.mk. NS
Answer
marnet.mk. 5 NS ns1.io.mk.
marnet.mk. 5 NS dns.marnet.mk.
marnet.mk. 5 NS ns2.io.mk.
Authority
The response has no authority records.
Additional
dns.marnet.mk. 5 A 185.162.192.33
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0