mx1.vsi.ru has no NS records.
NS records for this zone are defined at vsi.ru.
NS records for this zone are defined at vsi.ru.
Question and response
Question
dig mx1.vsi.ru. NS
Answer
The response has no answer records.
Authority
vsi.ru. 3600 SOA ns.vsi.ru. noc.vsi.ru. 2026012000 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0