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7/24/2026
The original title is "Building a Free Subdomain Registry with Python, Cloudflare, and GitHub Actions"

The original title is "Building a Free Subdomain Registry with Python, Cloudflare, and GitHub Actions"

Original: I wanted free subdomains for my project. Ended up building my own registry in Python (and fighting DNS, Git and Cloudflare along the way)

Short summary

The author built a free subdomain registry on fluxcast.dev inspired by is-a.dev, allowing anyone to claim a subdomain via a GitHub PR with JSON configuration. The article covers validation challenges (duplicate JSON keys, private IP blocking), Cloudflare SDK issues, Git submodule mistakes, and HSTS certificate propagation on .dev domains. The registry is open-source and live, with no approval process beyond a basic harmfulness check.

  • •Built a free subdomain registry on fluxcast.dev using Python, Cloudflare, and GitHub Actions
  • •Covers real debugging: duplicate JSON keys, Cloudflare SDK changes, Git submodule cleanup, HSTS cert issues
  • •Open-source, no accounts required, PR-based domain claims

Generated with AI, which can make mistakes.

#open-source
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