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Security concern about Workbench's source IP addresses

Knowledge Article Number 000214031
Description I noticed that is using a non-Salesforce IP address. Why is this?
Resolution is hosted on Heroku and thereby on AWS (Amazon Web Services), which uses the IP ranges documented at, instead of the IP addresses used by Salesforce servers.

If this is a concern, you may consider configuring workbench within a firewall server in your company's network and use the source code and instructions found in this GitHub repository: Alternatively, if you are an existing Heroku customer, you may run this app on your own Heroku instance.

Please note that Workbench is NOT a supported product of or supported by Salesforce. 

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