Apex domains cannot have CNAME records.
Question and response
Question
dig onenet.by. NS
Answer
onenet.by. 5 NS ns2.1net.by.
onenet.by. 5 NS ns1.1net.by.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0