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Open-source tools & agent skills to build the things you’re paying for.

portchecker.io

Project198

Self-host a web UI and API for on-demand TCP port checks against hostnames or IP addresses.

Added 2026-10-07
Replaces
GitHub

What you can build

  • Build a CSV importer that sends each hostname-and-port pair to the documented API and exports the input rows with their check results.
  • Build a release preflight that takes a deployment target and port, checks reachability through the API, and returns a pass-or-fail result.
  • Build a verifier that checks a supplied expected-reachability list and outputs the targets whose observed port availability differs from the expected state.
  • Build a change-review tool that checks the same host-and-port inputs before and after a network change, then outputs only pairs whose results changed.
  • Build a scheduler that checks a fixed target list through the API and appends timestamped outcomes to a file, creating a history the project does not provide.

Try this prompt

Build an end-to-end deployment connectivity preflight using portchecker.io. Accept a deployment hostname or IP address and TCP port, submit the check using the request format in the documented API specification, and show a clear pass-or-fail result. Preserve the submitted target, port, and returned result in an exportable record. Inspect the specification before implementing requests; do not assume undocumented routes or response fields. Keep the workflow small and do not overwrite prior records.

Get started

  1. Choose a setup path

    The README documents Docker Compose for development or production, and standalone frontend and API setup. Standalone frontend development requires Node 26 or newer; the API requires Python 3.13 and Poetry.

  2. Follow the setup instructions

    Use the README’s Docker or standalone development instructions to run the UI and API. For standalone use, the documented API_URL setting points the frontend to a non-default API address.

  3. Review API and monitoring documentation

    Consult the API specification linked at https://portchecker.io/docs for request details. The README also documents the /metrics endpoint and a Prometheus scrape configuration.

License & notes

GPL-3.0The software is GPL-3.0, which permits commercial use subject to its terms. Self-hosting requires compute and hosting; no model or paid API is documented. If you convey copies, GPL-3.0 conditions apply, including providing the required license notices and corresponding source for conveyed non-source forms. Private use or modification without conveying copies does not by itself require publishing source, and network interaction alone is not conveying under GPL-3.0.

  • Checks are on demand; continuous monitoring, alerting, and result history require separate workflows or services.
  • Private IP checks are disabled by default; the README documents ALLOW_PRIVATE for enabling checks of private IP ranges.
  • Self-hosting requires compute and hosting. GPL-3.0 obligations apply when conveying copies; private use without conveying does not itself require publishing source.

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