belgorod.admin.sardinasystems.com has no NS records.
NS records for this zone are defined at admin.sardinasystems.com.
NS records for this zone are defined at admin.sardinasystems.com.
Question and response
Question
dig belgorod.admin.sardinasystems.com. NS
Answer
The response has no answer records.
Authority
admin.sardinasystems.com. 60 SOA a.ns.admin.sardinasystems.com. hostmaster.admin.sardinasystems.com. 1772317738 300 60 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0