If you need for example to whitelist the remote IPs which can access a certain external resource (e.g., a database), you can whitelist our IPs based on the location. First you need to get the location str_id, which is available here:
https://api.openode.io/global/available-locations
Using the proper str_id depending where you deployed, you can get the list of IPs here
https://api.openode.io/global/available-locations/global/available-locations/:str_id/ips