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