node1.B15.dnstech.ru has no NS records.
NS records for this zone are defined at dnstech.ru.
NS records for this zone are defined at dnstech.ru.
Question and response
Question
dig node1.B15.dnstech.ru. NS
Answer
The response has no answer records.
Authority
dnstech.ru. 3600 SOA ns1.yandexcloud.net. mx.cloud.yandex.net. 1 10800 900 604800 86400
Additional
. 0 OPT ; payload 1024, xrcode 0, version 0, flags 0