Subnet Mask to Wildcard Mask Converter - Free, Instant, In Your Browser
Enter a value in Subnet Mask to convert it to Wildcard Mask.
How to use SUBNET-MASK → WILDCARD-MASK
- 1Paste your text or data into the input box above.
- 2SUBNET-MASK → WILDCARD-MASK runs instantly, right in your browser.
- 3Copy the result or use it directly.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
A wildcard mask is the bitwise complement of a subnet mask (used in Cisco ACLs and OSPF), so converting is symmetric: 255.255.255.0 <-> 0.0.0.255.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.