Apex domains cannot have CNAME records.
Question and response
Question
dig vturl.fi. NS
Answer
vturl.fi. 1 NS c.ns.buddyns.com.
vturl.fi. 1 NS j.ns.buddyns.com.
vturl.fi. 1 NS k.ns.buddyns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0