Apex domains cannot have CNAME records.
Question and response
Question
dig reg.uz. NS
Answer
reg.uz. 5 NS ns2.reg.uz.
reg.uz. 5 NS ns1.reg.uz.
Authority
The response has no authority records.
Additional
ns1.reg.uz. 5 A 217.160.92.99
ns2.reg.uz. 5 A 87.106.252.211
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0