mailhost.gazprom.ru has no NS records.
NS records for this zone are defined at gazprom.ru.
NS records for this zone are defined at gazprom.ru.
Question and response
Question
dig mailhost.gazprom.ru. NS
Answer
The response has no answer records.
Authority
gazprom.ru. 3600 SOA ns.gazprom.ru. sysadm.gazprom.ru. 2026031204 900 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0