Apex domains cannot have CNAME records.
Question and response
Question
dig tes.ee. NS
Answer
tes.ee. 3 NS cns1.estpak.ee.
tes.ee. 3 NS cns2.estpak.ee.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0