Some applications use third party hosted databases like MongoDB Atlas or Google Spanner, which can be secured with an allowed IP list.
Render users can now use https://www.quotaguard.com as an addon to get a static outbound IP for all their services. This feature requires setting up QuotaGuard through the Addons screen in the Render dashboard.
Allow users to request and enable static outbound IPs for some or all of their services natively without QuotaGuard.