Reminder: We strongly suggest not using whitelisting for your MplusKASSA database, because this is very maintenance intensive. Especially if you whitelist by IP, because every new API server we add to our network will need to be added to the whitelist.
To provide security to your database instance, we definitely recommend/require using SSL encryption on the database: PostgreSQL SSL Manual
Additionally, you may limit access to the database to the necessary database users only, and excluding the
postgres (root) user.
If you do want to use whitelist, here is an up-to-date list of all the IP-addresses we may try to access your database from: