Fastweb:
dns1: 85.18.200.200
dns2: 213.140.2.12

Google:

dns1: 8.8.8.8

dns2: 8.8.4.4

Intred:

dns1: 62.97.32.21

dns2: 62.97.33.21

Welcome Italia:

dns1: 80.93.143.42

dns2: 80.93.143.44

Telecom Italia Business:

dns1: 151.99.0.100

dns2: 151.99.125.1

Telecom Alice:

dns1: 212.216.112.112

dns2: 212.216.172.62