Wildcard Mask to Subnet Mask Converter - Free, Instant, In Your Browser
Enter a value in Wildcard Mask to convert it to Subnet Mask.
How to use WILDCARD-MASK → SUBNET-MASK
- 1Paste your text or data into the input box above.
- 2WILDCARD-MASK → SUBNET-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: 0.0.0.255 <-> 255.255.255.0.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.