Apex domains cannot have CNAME records.
Question and response
Question
dig ut.ee. NS
Answer
ut.ee. 1 NS ns2.ut.ee.
ut.ee. 1 NS ns2.eenet.ee.
ut.ee. 1 NS ns.ut.ee.
Authority
The response has no authority records.
Additional
ns.ut.ee. 1 A 193.40.5.99
ns2.ut.ee. 1 A 193.40.5.76
ns2.eenet.ee. 1 A 193.40.0.11
ns2.eenet.ee. 1 AAAA 2001:bb8:2001:0:0:0:0:11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0