mx.densky.ru has no NS records.
NS records for this zone are defined at densky.ru.
NS records for this zone are defined at densky.ru.
Question and response
Question
dig mx.densky.ru. NS
Answer
The response has no answer records.
Authority
densky.ru. 86400 SOA densky.ru. den.densky.ru. 2024031722 10800 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0