Apex domains cannot have CNAME records.
Question and response
Question
dig nska.net. NS
Answer
nska.net. 5 NS dns1.nska.net.
nska.net. 5 NS dns0.nska.net.
nska.net. 5 NS dns3.nska.net.
Authority
The response has no authority records.
Additional
dns0.nska.net. 5 A 94.130.12.231
dns1.nska.net. 5 A 95.216.23.197
dns3.nska.net. 5 A 51.68.45.169
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0