RethinkDNS Resolver That Deploys to CF Workers, Deno Deploy, Fastly, Fly.io
Published on: 2025-07-26 22:04:14
It's a bird, it's a plane, it's... a self-hosted, pi-hole esque, DNS resolver
serverless-dns is a Pi-Hole esque content-blocking, serverless, stub DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT) resolver. Runs out-of-the-box on Cloudflare Workers, Deno Deploy, Fastly Compute@Edge, and Fly.io. Free tiers of all these services should be enough to cover 10 to 20 devices worth of DNS traffic per month.
The RethinkDNS resolver
RethinkDNS runs serverless-dns in production at these endpoints:
Cloud platform Server locations Protocol Domain Usage ⛅ Cloudflare Workers 280+ (ping) DoH sky.rethinkdns.com configure 🦕 Deno Deploy 30+ (ping) DoH private beta ⏱️ Fastly Compute@Edge 80+ (ping) DoH private beta 🪂 Fly.io 30+ (ping) DoH and DoT max.rethinkdns.com configure
Server-side processing takes from 0 milliseconds (ms) to 2ms (median), and end-to-end latency (varies across regions and networks) is between 10ms to 30ms (median).
The Rethink DNS resolver on Fly.io is sponsored by FOSS United.
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