mx1.terrakultur.ru has no NS records.
NS records for this zone are defined at terrakultur.ru.
NS records for this zone are defined at terrakultur.ru.
Question and response
Question
dig mx1.terrakultur.ru. NS
Answer
The response has no answer records.
Authority
terrakultur.ru. 300 SOA ns1.beget.com. hostmaster.beget.com. 1757967045 300 600 86400 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0