Subnet / CIDR Calculator

About Subnet / CIDR Calculator

Enter an IP address and CIDR prefix (e.g. 192.168.1.0/24) to instantly get the network address, broadcast address, subnet mask in decimal and binary, first and last usable host, wildcard mask, and total host count. Essential for network engineers and DevOps.

How To Use

  1. Paste or load the code, payload, or data you want to inspect into Subnet / CIDR Calculator.
  2. Run the formatter, validator, converter, or generator shown in the tool controls and Subnet / CIDR Calculator processes it in your browser.
  3. Copy the cleaned output to your clipboard, or export it as a file when the tool provides a download.

Example

Input: A snippet of code, a JSON payload, or a data string.

Output: Formatted, validated, converted, or generated output you can paste straight back into your project.

Who Uses Subnet / CIDR Calculator

  • Developers who prefer private, browser-only tools for formatting, validation, and data work.
  • Engineers who need fast local tools without installing anything or uploading code.
  • Teams that want private — files and text stay on your device and are never uploaded to a server.

Frequently Asked Questions

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation expresses an IP address and its subnet mask as a suffix, e.g. /24 means 255.255.255.0.

How many hosts does /24 support?

A /24 subnet has 256 addresses, 254 usable hosts (minus network and broadcast addresses).

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