Get a finite list of IP addresses for my Heroku App?
heroku
Solution
No, Heroku will not give you even a range of IP addresses - they can, may and will move dynos between Amazon zones as needs require.
Your only option would be some sort of proxy node with a static IP that they talk to that securely communicates to your Heroku app - or consider if Heroku is the right fit for you here altogether.
Problem
I have client who wants to send a GET request to my Heroku application. They have asked for a list of IP address to whitelist for egress on their firewall. I realize this could change weekly or more often, but is it possible to get a finite list of IPs my Heroku app could be on? I saw the following excerpt on a Google Groups page for Heroku, but I could not find it corroborated anywhere else or how to see the list of addresses my app uses. Right now your CNAME setup will round-robin between 8 or so IP addresses, and we find If the list of IP addresses is virtually infinite, do you have any other suggestions for receiving the "GET" request through a firewall economically?