dns4.fastweb.it has no NS records.
NS records for this zone are defined at fastweb.it.
NS records for this zone are defined at fastweb.it.
Question and response
Question
dig dns4.fastweb.it. NS
Answer
The response has no answer records.
Authority
fastweb.it. 86400 SOA dns3.fastweb.it. dnsmaster.fastweb.it. 2026021000 10800 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0