mx.omnibit.it has no NS records.
NS records for this zone are defined at omnibit.it.
NS records for this zone are defined at omnibit.it.
Question and response
Question
dig mx.omnibit.it. NS
Answer
The response has no answer records.
Authority
omnibit.it. 10800 SOA dns.widhost.net. postmaster.omnibit.it. 2020110402 3600 900 432000 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0