[ushakov]

as far as i remember when the backend times out, CloudFlare shows a screen where you can see the actual IP of the server

[jffry]

I have seen the screen where Cloudflare cannot contact the origin and it absolutely does not include the IP address or other details about the origin.

You might be thinking of the "Ray ID" that Cloudflare displays on that page, which is just a random request ID that has nothing to do with the origin server.

[dewey]

That would defeat the whole purpose of using Cloudflare as an anti-ddos measure so I doubt that.