🌐 VLSM Calculator & Visualizer

An interactive web application that computes and visualizes Variable Length Subnet Masking (VLSM) addressing plans. Built with Python and Streamlit, it takes a base network and a list of host requirements, then outputs an optimized subnetting plan.

Personal project — built to practice networking concepts and web app development with Streamlit

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Features

• Input: base network address (e.g., 192.168.1.0/24) and host requirements per subnet
• Automatic VLSM calculation with optimal subnet allocation
• Visual representation of the addressing plan
• Subnet details: network address, broadcast, usable range, mask, CIDR notation
• Interactive Streamlit web interface — no installation needed for end users

How VLSM works

VLSM allows subnets of different sizes within the same network, unlike fixed-length subnetting. The algorithm:

1. Sorts subnets by size (largest first)
2. Allocates the smallest power-of-2 block that fits each requirement
3. Assigns network addresses sequentially to avoid overlap

Tech stack

Component	Technology
Language	Python
Web framework	Streamlit
Networking	ipaddress (stdlib)

Getting started

git clone https://github.com/AmZzPYJS/VLSM-Calculator-and-Vizualisation-Python.git
cd VLSM-Calculator-and-Vizualisation-Python
pip install -r requirements.txt
streamlit run app.py

What I learned

• Implementing VLSM subnetting logic from scratch using Python's ipaddress module
• Building interactive web applications with Streamlit (widgets, layouts, session state)
• Translating networking theory (subnet masks, CIDR, broadcast addresses) into working code
• Designing a user-friendly interface for a technical tool

License

MIT