# CIDR / subnet calculator

Canonical page: https://nepocore.com/tools/subnet-calculator/

Calculate an IPv4 network, mask, address range and host interpretation from an address and CIDR prefix.

## How to use it

1. Enter your own values or choose a supported file.
2. Adjust the options and run the tool.
3. Review the result, then copy, export or save it when available.

## Example

Enter 192.0.2.143/27 to inspect its network and conventional host range.

## Limits and checks

Conventional broadcast subnets, /31 point-to-point links and /32 host routes have different host rules. This calculator labels those cases explicitly.

## Access and processing

Free to use without an account. Interactive processing requires JavaScript in a modern browser. Input is processed in the browser rather than sent to a processing server. Optional browser storage is not a synchronized account.


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