Earlier quoted context omitted.
The "Get ready for iCloud Private Relay" session[1] from this year's WWDC makes it seem like there will be a publicly available list of IP addresses used by Private Relay: Private Relay guarantees that users can't use the system to pretend to be from a different region, so you can continue to enforce region-based access restrictions. Details about the proxy IP addresses will be available as an article associated with…
Here's the article: https://developer.apple.com/support/prepare-your-network-for... And their IPs, as mentioned in that article: https://mask-api.icloud.com/egress-ip-ranges.csv Seems to be mostly Fastly IP addresses right now, but I'm sure that'll change over time.
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