mx3.rt-solar.ru has no NS records.
NS records for this zone are defined at rt-solar.ru.
NS records for this zone are defined at rt-solar.ru.
Question and response
Question
dig mx3.rt-solar.ru. NS
Answer
The response has no answer records.
Authority
rt-solar.ru. 600 SOA ns3-l2.nic.ru. dns.nic.ru. 2018071138 1440 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0