I’ve built CloakProbe, a small Rust-based “What is my IP?”-style service that is designed to be privacy-first and self-hosted, sitting safely behind Cloudflare.

Why I built it ---------------

Most “what is my IP” sites are overloaded with trackers, ads and 3rd-party scripts. I wanted something I can put behind Cloudflare that:

- doesn’t track visitors,

- doesn’t log more than absolutely necessary,

- and still gives deep technical info for debugging clients and Cloudflare setups.

What CloakProbe does --------------------

- Shows your public IP, IP version and basic geoinfo.

- Resolves ASN info from a local ip2asn-based database (no external lookups).

- Parses Cloudflare headers (CF-Connecting-IP, CF-Ray, CF-Visitor, etc.).

- Works for both IPv4 and IPv6.

- Has a minimal, dark, no-3rd-party frontend.

- No analytics, no external fonts, no 3rd-party scripts.

Tech details ------------

- Written in Rust with Axum.

- Designed to sit behind Cloudflare; trusts only Cloudflare IP ranges and headers.

- Local ASN DB built from ip2asn-combined TSV via a small Rust builder binary.

- Nginx example config + ASN update script included.

Repo & demo -----------

GitHub: https://github.com/drmckay/cloakprobe

Landing page: https://cloakprobe.dev/

I’d love feedback on:

- security assumptions

- ideas for additional leak/fingerprinting/debug tests that still respect privacy,

- rough edges in the setup docs for self-hosting.

Happy to iterate if people find this useful.