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Show HN: Detect paid Cloudflare plans on any website via ECH

1 rapawel 1 9/14/2025, 2:59:05 PM experiments.pawelpokrywka.com ↗

A tool that checks if any website uses a paid Cloudflare subscription by examining their public /cdn-cgi/trace endpoint. Cloudflare only allows disabling Encrypted Client Hello (ECH) in paid plans, so sni=plaintext indicates a paid subscription. Works on any Cloudflare-proxied site.

Comments (1)

rapawel · 27s ago

Example website with paid subscription: Substack https://experiments.pawelpokrywka.com/cloudflare-subscriptio...