IPv4 Subnet Calculator
Calculate IPv4 network, broadcast, netmask, usable host range, and address count from an address and CIDR prefix.
What this tool does
Calculate IPv4 network, broadcast, netmask, usable host range, and address count from an address and CIDR prefix.
Where this tool is useful
Inspect network boundaries for CIDR blocks including /31 and /32.
Example or format details
192.168.1.42/24 belongs to 192.168.1.0/24 with broadcast address 192.168.1.255.
How to use IPv4 Subnet Calculator
- 1
Paste the technical input into the form and choose any relevant algorithm or formatting options.
- 2
Adjust the fields and options, then select Run tool.
- 3
Inspect the actual result. Copy the text or download the generated file when appropriate.
Privacy and processing
Entered content and chosen files are processed locally in your browser. No conversion request is sent to a freedropper server.
Common questions
What can I use this for?
Inspect network boundaries for CIDR blocks including /31 and /32.
What does the tool accept?
Paste the technical input into the form and choose any relevant algorithm or formatting options.
What should I check before using the output?
Check the accepted input, output format and settings before reusing the result. Inspect network boundaries for CIDR blocks including /31 and /32.
Does my input leave my device?
The utility runs in your browser. Selected content is not transmitted to a freedropper conversion service.
How can I reuse the result?
Copy the output or use the download control when the tool produces a file. Check the target application accepts the resulting syntax or file type.