mail.VLAD.RU has no NS records.
NS records for this zone are defined at VLAD.RU.
NS records for this zone are defined at VLAD.RU.
Question and response
Question
dig mail.VLAD.RU. NS
Answer
The response has no answer records.
Authority
vlad.ru. 86400 SOA ns.vmts.ru. dnsmaster.vmts.ru. 2025012001 86400 7200 1468800 86400
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0