List of ip address that apigee use for proxyng api request to our backend?

[a_valentini]

I have the need to secure api access on our backend.

i have already setted up api access authentication using client certificate,

The question is, How can I retrieve a list of ip address that apigee use for proxyng api request?

Having that white list of ip address can I ensure that all calls only come from these address and that these are non modified? Or will I be informed on changes of that?

Thank you

Alessandro Valentini