calculateCIDR

CLI CIDR network calculator with IPv4 & IPv6 support, wildcard mask, subnet division and binary display.

✨ Features

• 🌐 IPv4 & IPv6 — full support for both address families
• 🧩 Subnet division — split any network into N subnets with correct prefix math
• 🔢 Wildcard mask — inverse netmask (Cisco-style) included in every output
• 🔠 Binary display — view any field in binary octet notation (IPv4)
• 📏 Flexible output — horizontal (default) or vertical format
• 🌈 Color-coded — ANSI colors for fast readability

📥 Installation

pip install cidr-calculator

Or clone and install locally:

git clone https://github.com/serber1990/calculateCIDR.git
cd calculateCIDR
pip install -e .

🛠 Usage

cidr -ip <IP/PREFIX> [-divide N] [-binary] [-vertical] [-v] [-h]

🎨 Examples

Basic calculation

cidr -ip 192.168.1.0/24

+-----------------+-------------+-----------+-----------+-----------------+---------------+---------------+---------+
| Network         | Network ID  | Gateway   | Last Host | Broadcast       | Netmask       | Wildcard      | Hosts   |
+=================+=============+===========+===========+=================+===============+===============+=========+
| 192.168.1.0/24  | 192.168.1.0 | 192.168.1.1 | 192.168.1.254 | 192.168.1.255 | 255.255.255.0 | 0.0.0.255 | 254 |
+-----------------+-------------+-----------+-----------+-----------------+---------------+---------------+---------+

Vertical format

cidr -ip 10.0.0.0/8 -vertical

Subnet division

cidr -ip 192.168.1.0/24 -divide 4

Splits /24 into 4 subnets (/26), showing network ID, gateway, last host, broadcast, netmask, wildcard and host count for each.

Binary display

cidr -ip 192.168.1.0/24 -binary

IPv6

cidr -ip 2001:db8::/32

📝 License

MIT — see LICENSE.

💬 Feedback

Open an issue or reach out via GitHub.

🌐 Connect