GitHub Meta IP Checker

A client-side web application hosted on GitHub Pages that checks whether an IP address or CIDR range exists within GitHub's infrastructure IP ranges.

Features

• IP/CIDR Lookup — Enter any IPv4 or IPv6 address (or CIDR range) to check if it belongs to GitHub
• Service Identification — Shows which GitHub service(s) the IP belongs to (Actions, Pages, Copilot, API, etc.)
• Daily Monitoring — A GitHub Actions workflow runs daily to track changes to the Meta API endpoint
• Update History — View a timeline of IP range additions and removals with affected services
• Fully Client-Side — All lookups run in your browser; no data is sent to any backend

How It Works

1. The app fetches data directly from https://api.github.com/meta in your browser
2. IP/CIDR matching is performed entirely client-side using JavaScript
3. A daily GitHub Actions cron job compares the current Meta API response with a stored snapshot
4. Any changes (added/removed IP ranges) are committed to data/updates.json and displayed in the app

Setup for GitHub Pages

1. Push this repository to GitHub
2. Go to Settings → Pages
3. Set the source to Deploy from a branch → main → / (root)
4. The site will be available at https://<username>.github.io/MetaIPCheck/

Setup Daily Monitoring

The GitHub Actions workflow (.github/workflows/monitor-meta.yml) will automatically:

• Run daily at 06:00 UTC
• Fetch the latest GitHub Meta API data
• Compare with the previous snapshot
• Commit any changes to the data/ directory

To initialize the first snapshot, manually trigger the workflow:

1. Go to Actions → Daily GitHub Meta IP Monitor
2. Click Run workflow

Project Structure

MetaIPCheck/
├── index.html                          # Main HTML page
├── css/
│   └── style.css                       # Styles (GitHub dark theme)
├── js/
│   ├── ip-utils.js                     # IPv4/IPv6 CIDR matching logic
│   └── app.js                          # Main application logic
├── data/
│   ├── meta-snapshot.json              # Latest Meta API snapshot
│   └── updates.json                    # Change history
└── .github/
    └── workflows/
        └── monitor-meta.yml            # Daily monitoring workflow

Security

This application runs entirely client-side. No IP addresses or search queries are logged or transmitted to any server. The only external API call is to GitHub's public Meta API endpoint.

License

MIT