mail.SIBDC.RU has no NS records.
NS records for this zone are defined at SIBDC.RU.
NS records for this zone are defined at SIBDC.RU.
Question and response
Question
dig mail.SIBDC.RU. NS
Answer
The response has no answer records.
Authority
SIBDC.RU. 43200 SOA ns1.snt.RU. dnsmaster.sinor.RU. 2026021600 86400 7200 1209600 345600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0