About IPv4 Wildcard Mask Calculator

The Wildcard Calculator is designed to compute the smallest possible wildcard mask for multiple subnets. By consolidating and optimizing input subnets, it ensures precise matching while avoiding unnecessary hosts or network segments. As one of the only tools of its kind available online, it provides a unique solution for network professionals.

Why Use It

Many network professionals struggle with wildcard masks that unintentionally cover more IP ranges than needed. If you want a tool that minimizes overmatching and ensures accuracy in ACLs, routing filters, or other network configurations, this is exactly what you need!

Input Format

Format: One subnet per line or comma-separated (e.g., 192.168.1.0/24, 192.168.3.0/24)

* If you already have a wildcard mask and an IP address and want to see the corresponding normalized wildcard notation, please use our IPv4 Wildcard Mask Validation Tool tool.