mx2.kubtel.ru has no NS records.
NS records for this zone are defined at kubtel.ru.
NS records for this zone are defined at kubtel.ru.
Question and response
Question
dig mx2.kubtel.ru. NS
Answer
The response has no answer records.
Authority
kubtel.ru. 300 SOA ns5.kubtel.ru. noc.kubtel.ru. 2026020400 3600 900 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0