Function App - single outbound IP address

Question

Please, what are the options for a Function App resource connected to a premium App Service plan to have only one outbound IP address. I need to use whitelists and I can't put the 40x outbound IP address there. Now I use a NAT gateway for this functionality, but it costs me 50% of the entire Azure cost. Are there some other options? Thank you very much for you help!

Answer 1

Hi Jaroslav,

Welcome to Q&A.

There are 2 options (as of today at least):

• Use premium or dedicated with NAT gateway (like you are doing)
• Use App service Environment which is the Isolated tier of App service plan

Source: https://learn.microsoft.com/en-us/azure/azure-functions/ip-addresses?tabs=portal#dedicated-ip-addresses

Another option would be to whitelist the IPs of the region. A set of JSON is available:

https://learn.microsoft.com/en-us/azure/azure-functions/ip-addresses?tabs=portal#data-center-outbound-ip-addresses

Hope that helps.

Answer 2

Thank you very much for your help, Isolated tier is better way for me then NAT gateway.