Apex domains cannot have CNAME records.
Question and response
Question
dig hoster.by. NS
Answer
hoster.by. 5 NS dns2.hoster.by.
hoster.by. 5 NS dns1.hoster.by.
Authority
The response has no authority records.
Additional
dns1.hoster.by. 5 A 93.125.31.240
dns2.hoster.by. 5 A 185.179.82.103
dns1.hoster.by. 5 AAAA 2a0a:7d80:1:1:0:0:5:0
dns2.hoster.by. 5 AAAA 2a0a:7d80:3:1:0:0:0:7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0