redmine.retelit.it has no NS records.
NS records for this zone are defined at retelit.it.
NS records for this zone are defined at retelit.it.
Question and response
Question
dig redmine.retelit.it. NS
Answer
The response has no answer records.
Authority
retelit.it. 1800 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2398790639 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0