Apex domains cannot have CNAME records.
Question and response
Question
dig domashka.net. NS
Answer
domashka.net. 5 NS ns2.skif.com.ua.
domashka.net. 5 NS ns3.skif.com.ua.
domashka.net. 5 NS ns1.skif.com.ua.
Authority
The response has no authority records.
Additional
ns1.skif.com.ua. 5 A 195.20.96.20
ns2.skif.com.ua. 5 A 94.45.45.46
ns3.skif.com.ua. 5 A 176.105.98.142
ns1.skif.com.ua. 5 AAAA 2a01:6d80:0:0:0:0:1:3
ns2.skif.com.ua. 5 AAAA 2a01:6d80:2000:0:0:0:1:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0