SharePoint Online workflow IPaddresses

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I am using SharePoint online in the US region. There is an option in a custom 2013 workflow to send an HTTP request. For firewall purposes, what are the IP addresses that SharePoint online uses for outgoing http requests from workflows?

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The IP will depend on the region and server cluster. The admin section of SP Online will not provide that information - mine does not. To find out your IP, you will have to create a test server and the connections logs. A simple apache or Nginx will go.