mx1.ip-stream.ru has no NS records.
NS records for this zone are defined at ip-stream.ru.
NS records for this zone are defined at ip-stream.ru.
Question and response
Question
dig mx1.ip-stream.ru. NS
Answer
The response has no answer records.
Authority
ip-stream.ru. 86400 SOA ip-stream.ru. root.ip-stream.ru. 2025042801 28800 14400 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0