What IPs should I whitelist for my firewall?

What Ip should I whitelist?

AirBrake Currently uses the dedicated IP to receive errors.

Double check the host your notifier is uses

You want your notifier to use this above ip or the api.airbrake.io address.
This is usually configured as the airbrake_host or just host depending on which notifier you use.

Let us know if you have any questions: email support@airbrake.io