Apex domains cannot have CNAME records.
Question and response
Question
dig to.ee. NS
Answer
to.ee. 3 NS jupiter.to.ee.
to.ee. 3 NS ns.ut.ee.
to.ee. 3 NS ns2.ut.ee.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0