mx.ncnet.ru has no NS records.
NS records for this zone are defined at ncnet.ru.
NS records for this zone are defined at ncnet.ru.
Question and response
Question
dig mx.ncnet.ru. NS
Answer
The response has no answer records.
Authority
ncnet.ru. 3600 SOA nsmt.rt.ru. hostmasternsmt.rt.ru. 2020122400 86400 7200 604800 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0