mx.belanovi.com has no NS records.
NS records for this zone are defined at belanovi.com.
NS records for this zone are defined at belanovi.com.
Question and response
Question
dig mx.belanovi.com. NS
Answer
The response has no answer records.
Authority
belanovi.com. 3600 SOA dns.belanovi.com. hostmaster.belanovi.com. 1327242913 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0