Apex domains cannot have CNAME records.
Question and response
Question
dig ohituskaista.net. NS
Answer
ohituskaista.net. 5 NS ns1.ratkaisutalo.fi.
ohituskaista.net. 5 NS ns2.ratkaisutalo.fi.
Authority
The response has no authority records.
Additional
ns1.ratkaisutalo.fi. 5 A 88.148.137.100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0