pochta.mtw.ru has no NS records.
NS records for this zone are defined at mtw.ru.
NS records for this zone are defined at mtw.ru.
Question and response
Question
dig pochta.mtw.ru. NS
Answer
The response has no answer records.
Authority
mtw.ru. 43200 SOA mtw.ru. hostmaster.mtw.ru. 2020001287 3600 3600 1209600 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0