🚨 GitHub 404 Subdomain Checker – A simple Python tool to check if subdomains point to GitHub 404 pages, which may indicate a potential subdomain takeover vulnerability.

• Reads subdomains from list.txt
• Detects and logs subdomains that return a GitHub-branded 404 page
• Saves vulnerable subdomains to 404.txt

1. Clone the repository:

   git clone https://github.com/0xBakusedu/Github-404.git
   cd Github-404

2. Install dependencies: Make sure Python 3 and pip are installed.

   pip install -r requirements.txt

   Contents of requirements.txt:

   requests
   colorama
   

3. Add your subdomains to list.txt: Example:

   example.github.io
   subdomain.example.com
   

4. Run the script:

   python3 checker.py

• Subdomains returning a GitHub-branded 404 will be saved in 404.txt

• Console output example:

  [404] https://example.github.io/
  [OK ] https://valid.example.com/
  

This tool is intended for educational and authorized security testing purposes only. Use it responsibly. The author is not responsible for any misuse or damages caused by this tool.

• 0xBakusedu
• williamlaurent

This project is licensed under the MIT License.