Hi There,
Thank you for asking this question on the Microsoft Q&A Platform.
In normal, Azure logic app(Azure Pass service) provides a set of IPs for each region. You can find these IPs from here.
Besides, if you want to set up the static IP for logic app, you can you can set up an integration service environment (ISE) for hosting logic apps. Then all the ISE instances can use a single, public, static, and predictable IP address to communicate with the destination systems that you want.
Meanwhile, you also can use Azure API Management to act as a reverse proxy for the Logic App. Meaning you could set up API Management (which has a single IP address) to accept calls from the Logic App and proxy them to any end-system you want so they always appear to be from that IP Address regardless of the source. For more details, please refer to here.
Regards,
Kamlesh Kumar
BizTalk Techie
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