pm.gtnet.ru has no NS records.
NS records for this zone are defined at gtnet.ru.
NS records for this zone are defined at gtnet.ru.
Question and response
Question
dig pm.gtnet.ru. NS
Answer
The response has no answer records.
Authority
gtnet.ru. 3600 SOA inn361.ru. inn.inn361.ru.gtnet.ru. 2026020902 86400 3600 604800 345600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0