Apex domains cannot have CNAME records.
Question and response
Question
dig nebulacloud.fi. NS
Answer
nebulacloud.fi. 3 NS ns2.nebula.fi.
nebulacloud.fi. 3 NS ns.nebula.fi.
Authority
The response has no authority records.
Additional
ns.nebula.fi. 5 A 217.30.180.225
ns2.nebula.fi. 5 A 217.30.182.225
ns.nebula.fi. 5 AAAA 2001:1bc8:100c:a180:0:0:0:225
ns2.nebula.fi. 5 AAAA 2001:1bc8:103:9:0:0:0:17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0