CIDR to Wildcard Mask Converter - Free, Instant, In Your Browser
Enter a value in CIDR to convert it to Wildcard Mask.
How to use CIDR → WILDCARD-MASK
- 1Paste your text or data into the input box above.
- 2CIDR → 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?
Computes the subnet mask from the CIDR prefix first, then bitwise-complements each octet - e.g. /24 gives 0.0.0.255.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.