Apex domains cannot have CNAME records.
Question and response
Question
dig lasipalatsi.fi. NS
Answer
lasipalatsi.fi. 5 NS ns.kaapelinetworks.fi.
lasipalatsi.fi. 5 NS ns1.z.fi.
lasipalatsi.fi. 5 NS ns2.z.fi.
Authority
The response has no authority records.
Additional
ns.kaapelinetworks.fi. 5 A 77.72.56.56
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0