Wildcard Mask Calculator

Tech Calculators

Convert subnet masks to wildcard masks for Cisco ACLs.

0.0.0.255
Wildcard Mask

About This Tool

Essential tool for network engineers to convert standard subnet masks or CIDR prefixes into wildcard masks used in Cisco access control lists (ACLs) and OSPF.

Frequently Asked Questions

It is an inverted subnet mask where 0 means "match" and 1 means "ignore" during bitwise comparison.

They are primarily used in Cisco Routers for Access Control Lists (ACLs) and routing protocols like OSPF.

Subtract each octet of the subnet mask from 255 (e.g., 255.255.255.0 becomes 0.0.0.255).

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