mx2.astranet.ru has no NS records.
NS records for this zone are defined at astranet.ru.
NS records for this zone are defined at astranet.ru.
Question and response
Question
dig mx2.astranet.ru. NS
Answer
The response has no answer records.
Authority
astranet.ru. 1800 SOA ns1.astranet.ru. smena.astranet.ru. 2026021800 3600 900 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0