mail.SV-EN.RU has no NS records.
NS records for this zone are defined at SV-EN.RU.
NS records for this zone are defined at SV-EN.RU.
Question and response
Question
dig mail.SV-EN.RU. NS
Answer
The response has no answer records.
Authority
SV-EN.RU. 259200 SOA ns1.SV-EN.RU. hostmaster.SV-EN.RU. 2026031802 86400 7200 2592000 345600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0