Whatmask for Windows

Name: Whatmask
Author: Laffey Computer Imaging

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Editors’ Review

Download.com staffFebruary 20, 2026

Whatmask is a lightweight command-line utility for network administrators. It converts between CIDR, netmask, and wildcard notations while calculating essential IP range details, including network, broadcast, and usable addresses.

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Free

Pros
- Converts between CIDR netmask and wildcard bits notations seamlessly
- Automatically detects input format for easier mask conversion
- Calculates network and broadcast addresses from IP and mask inputs
- Provides the total count of usable addresses in a range
- Lightweight C program optimized for command line execution
Cons
- Operates exclusively within a DOS shell or command prompt environment
- Lacks a graphical user interface for non-technical users
- No built-in support for IPv6 address calculations
- Limited to standard broadcast address configurations