mx.kes.esc-rushydro.RU has no NS records.
NS records for this zone are defined at esc-rushydro.RU.
NS records for this zone are defined at esc-rushydro.RU.
Question and response
Question
dig mx.kes.esc-rushydro.RU. NS
Answer
The response has no answer records.
Authority
esc-rushydro.RU. 600 SOA ns3-l2.nic.RU. baueraa.gidroogk.RU. 65012900 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0