na1.sign.co.it has no NS records.
NS records for this zone are defined at sign.co.it.
NS records for this zone are defined at sign.co.it.
Question and response
Question
dig na1.sign.co.it. NS
Answer
The response has no answer records.
Authority
sign.co.it. 1800 SOA crystal.ns.cloudflare.com. dns.cloudflare.com. 2398377794 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0