mx2.dtln.ru has no NS records.
NS records for this zone are defined at dtln.ru.
NS records for this zone are defined at dtln.ru.
Question and response
Question
dig mx2.dtln.ru. NS
Answer
The response has no answer records.
Authority
dtln.ru. 3600 SOA ns.dtln.ru. dns.dtln.ru. 2026012701 3600 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0