mail.superdata.vn has no NS records.
NS records for this zone are defined at superdata.vn.
NS records for this zone are defined at superdata.vn.
Question and response
Question
dig mail.superdata.vn. NS
Answer
The response has no answer records.
Authority
superdata.vn. 3600 SOA nsbak.dotvndns.com. hostmaster.superdata.vn. 2026022354 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0