mail.itmh.ru has no NS records.
NS records for this zone are defined at itmh.ru.
NS records for this zone are defined at itmh.ru.
Question and response
Question
dig mail.itmh.ru. NS
Answer
The response has no answer records.
Authority
itmh.ru. 600 SOA ns0.mirasystem.net. admins.mirasystem.net. 2023041701 3600 600 1209600 600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0