Apex domains cannot have CNAME records.
Question and response
Question
dig neste.fi. NS
Answer
neste.fi. 5 NS ns2.d-zone.ca.
neste.fi. 5 NS ns2.z.fi.
neste.fi. 5 NS ns.nesteoil.com.
neste.fi. 5 NS ns1.z.fi.
neste.fi. 5 NS ns1.nesteoil.com.
neste.fi. 5 NS ns2.nesteoil.com.
neste.fi. 5 NS ns1.d-zone.ca.
Authority
The response has no authority records.
Additional
ns.nesteoil.com. 5 A 132.155.58.8
ns1.d-zone.ca. 1 A 162.219.54.2
ns1.nesteoil.com. 5 A 132.155.58.9
ns2.d-zone.ca. 1 A 162.219.55.2
ns2.nesteoil.com. 5 A 132.155.58.10
ns1.d-zone.ca. 1 AAAA 2620:10a:80eb:0:0:0:0:2
ns2.d-zone.ca. 1 AAAA 2620:10a:80ec:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0