mta2.spin.it has no NS records.
NS records for this zone are defined at spin.it.
NS records for this zone are defined at spin.it.
Question and response
Question
dig mta2.spin.it. NS
Answer
The response has no answer records.
Authority
spin.it. 7200 SOA up.spin.it. hostmaster.spin.it. 2025072300 86400 7200 2419200 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0