Apex domains cannot have CNAME records.
Question and response
Question
dig astrin.uz. NS
Answer
astrin.uz. 4 NS ns01.uzsci.net.
astrin.uz. 4 NS ns02.uzsci.net.
Authority
The response has no authority records.
Additional
ns01.uzsci.net. 4 A 83.69.129.4
ns02.uzsci.net. 4 A 83.69.128.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0