Apex domains cannot have CNAME records.
Question and response
Question
dig localnet.fi. NS
Answer
localnet.fi. 5 NS ns2.localnet.fi.
localnet.fi. 5 NS ns1.localnet.fi.
localnet.fi. 5 NS ns3.localnet.fi.
Authority
The response has no authority records.
Additional
ns1.localnet.fi. 5 A 185.185.170.185
ns2.localnet.fi. 5 A 185.185.171.185
ns3.localnet.fi. 5 A 94.237.90.236
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0