Hi Sergio,
You can contact us privately on our pro-support address to request our current set of egress IPs (where database connections etc might originate), and receive updates in advance when that list changes. This list will of course be shared with other Anvil users.
If you are an Enterprise customer, we will give you one or more private IP addresses exclusive to your dedicated Anvil instance. Drop an email to support@anvil.works if this is something you need.
I hope that helps!