mx.fastcon.it has no NS records.
NS records for this zone are defined at fastcon.it.
NS records for this zone are defined at fastcon.it.
Question and response
Question
dig mx.fastcon.it. NS
Answer
The response has no answer records.
Authority
fastcon.it. 3600 SOA dns.technorail.com. hostmaster.fastcon.it. 2025120801 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0