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