manin.backgronds.com has no CNAME records.
Question and response
Question
dig manin.backgronds.com. NS
Answer
The response has no answer records.
Authority
backgronds.com. 10766 SOA ns1.bviabc.com. postmaster.bviabc.com. 2025111912 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0