CIDR Calculator
Convert an IPv4 CIDR prefix into mask, wildcard, address counts, network bits and host bits.
Processed locally — your input stays in this browser.
Examples and edge notes
Try /8, /24, and /32. Prefixes /0 through /32 are accepted. /31 has two usable addresses and /32 has one.
About CIDR Calculator
Calculate IPv4 subnet details from an address and CIDR prefix.
How to use it
Enter the requested value, review it for accuracy, then run the tool. Read the labeled result fields before copying or using them in another workflow.
Understanding the result
The result presents the values returned or calculated for this specific request. Labels and status messages distinguish successful data, empty results, validation problems, and network errors.
Limitations and privacy
Results are calculated from the values you provide and should be verified against your network requirements before operational changes. Runs locally in your browser; the value you enter is not sent to the Network Tools API.