ext2.msk-relay.otrs.hostcomm.ru has no NS records.
NS records for this zone are defined at otrs.hostcomm.ru.
NS records for this zone are defined at otrs.hostcomm.ru.
Question and response
Question
dig ext2.msk-relay.otrs.hostcomm.ru. NS
Answer
The response has no answer records.
Authority
otrs.hostcomm.ru. 600 SOA pdns.infra.nic.ru. noc-dns.nic.ru. 2019121902 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0