ns2.opcom.ru has no NS records.
NS records for this zone are defined at opcom.ru.
NS records for this zone are defined at opcom.ru.
Question and response
Question
dig ns2.opcom.ru. NS
Answer
The response has no answer records.
Authority
opcom.ru. 3600 SOA opcom.ru. root.opcom.ru. 20200824 86400 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0