About IPv4 Wildcard Mask Validation Tool

This IPv4 Wildcard Mask Validation Tool helps you quickly verify whether an IP address is contained within a wildcard mask range. It also automatically normalizes any non-standard wildcard notation you provide (e.g., converting 10.55.70.15 0.255.0.255 into the standard 10.0.70.0 0.255.0.255 notation). This ensures precise matching, reduces errors, and makes it easy to work with ACLs or other network configurations.

Input Format

Provide an IP address followed by a wildcard mask, in either standard or non-standard format. The tool will normalize your entry to a correct notation and then check if your IP falls under this newly generated range. Examples include:

• 10.55.163.58 0.0.1.255 → 10.55.162.0 0.0.1.255
• 10.55.70.15 0.255.0.255 → 10.0.70.0 0.255.0.255

* If you need to calculate the smallest possible wildcard mask for multiple subnets, please use our IPv4 Wildcard Mask Calculator.