🌐 CIDR Block IP Calculator

A lightweight web-based networking tool that calculates total, reserved, and usable IP addresses within a CIDR block.

Designed for subnet planning, networking education, and cloud infrastructure learning.

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🎬 Demo

The calculator in action:

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🚀 Features

• Calculate total IP addresses in CIDR blocks
• Calculate reserved IP addresses
• Calculate usable IP addresses
• CIDR input validation
• Step-by-step explanation of calculations
• Clean and responsive UI
• Fully browser-based (no installation required)

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🛠 Technologies

• HTML5
• CSS3
• JavaScript (ES6)

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📖 How to Use

Option 1 — Open Locally

1. Download or clone the repository
2. Open:

CIDR-Block-IP-Calculator.html

3. Run it in any modern browser
4. Enter CIDR values like:

/16
/20
/24
/28

5. Click Calculate

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Option 2 — Git Clone

git clone https://github.com/tcdoverlord/CIDR-Block-IP-Calculator.git
cd CIDR-Block-IP-Calculator

Open the HTML file in your browser.

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📊 Example

Input

/24

Output

Total IPs: 256
Reserved IPs: 5
Usable IPs: 251

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📂 Project Structure

CIDR-Block-IP-Calculator/
│
├── CIDR-Block-IP-Calculator.html
├── CIDR-Block-IP-Calculator-demo.gif
├── README.md
└── LICENSE

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💡 Use Cases

• Network engineering learning
• AWS / Azure VPC planning
• Subnetting practice
• IT training
• IPv4 addressing education

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🤝 Contributing

Contributions are welcome.

Feel free to open issues or submit pull requests.

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👨‍💻 Author

TCDOverLord

GitHub: https://github.com/tcdoverlord