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A fast, accurate IPv4 subnet calculator built with Python and Streamlit.

Live App:https://subnetter.streamlit.app

• Calculate subnet information from IP address + CIDR/dotted mask
• View network address, broadcast address, host range, and usable hosts
• Support for special cases (/31 point-to-point links, /32 single hosts)
• Download results as CSV
• Reference guide with common subnet masks and info
• Clean, responsive UI

• Python 3.8+
• pip

1. Clone the repository:

git clone https://github.com/ClayArch/subnetter-app.gitcd subnetter-app

2. Create a virtual environment:

python -m venv .venv.venv\Scripts\activate# Windowssource .venv/bin/activate# Mac/Linux

3. Install dependencies:

pip install -r requirements.txt

streamlit run subnetter/ui/app.py

The app will open athttp://localhost:8501

1. Enter an IP address (with or without CIDR notation)
2. If needed, enter a subnet mask
3. Click "Calculate"
4. View results across three categories: Network Info, Host Range, and Additional Info
5. Download results as CSV if needed

• 192.168.0.10/24

  or

• 192.168.0.10 255.255.255.0

MIT License

Feel free to open issues or submit pull requests for improvements.