ns.pulkov.spb.RU has no NS records.
NS records for this zone are defined at pulkov.spb.RU.
NS records for this zone are defined at pulkov.spb.RU.
Question and response
Question
dig ns.pulkov.spb.RU. NS
Answer
The response has no answer records.
Authority
pulkov.spb.RU. 3600 SOA ns.nalitch.spb.RU. rconst1.yandex.RU. 2020082500 10800 3600 432000 38400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0