zippydevtoolsNetwork and HTTP
CIDR/Subnet Calculator
Calculate network, broadcast, subnet mask, wildcard mask, and usable range for IPv4 CIDR blocks.
Process the input to see the result here.
Calculate network, broadcast, subnet mask, wildcard mask, and usable range for IPv4 CIDR blocks. CIDR/Subnet Calculator uses IPv4 CIDR (text, required) and returns a browser-generated result that can be reviewed before copying.
When to use
Use CIDR/Subnet Calculator when your workflow needs calculate network, broadcast, subnet mask, wildcard mask, and usable range for ipv4 cidr blocks. Example workflow: 192.168.1.0/24 -> Network, broadcast, mask, and usable address range..
Input
Enter the data requested by the tool. Fields: IPv4 CIDR (text, required). Example input: 192.168.1.0/24
Output
The tool returns a processed result to copy or review. Example output: Network, broadcast, mask, and usable address range.. Then use related tools to validate, convert, or continue the same workflow.
- Open the tool and review the expected input type. Fields: IPv4 CIDR (text, required).
- Paste, upload, or fill in the requested data in the form. Start from the example pattern: 192.168.1.0/24.
- Run the processing step and read validation messages if they appear.
- Review the result, copy only what you need, and validate it before production use.
- Calculate a /24 subnet: Use CIDR/Subnet Calculator in this workflow: 192.168.1.0/24 -> Network, broadcast, mask, and usable address range..
- subnet calculator: Use CIDR/Subnet Calculator for subnet calculator directly in the browser.
- Invalid or incomplete input: If the tool rejects the input, review these fields and formats before trying again: IPv4 CIDR (text, required). Review required fields, accepted formats, and validation messages before using the result.
- Sensitive data: Processing runs in the browser, so review any sensitive data before pasting, uploading, or sharing it. Avoid sharing results until you review tokens, documents, files, or personal data involved.
- Large inputs: Very large files or text can take longer in the browser and should be validated before critical workflows.
Calculate a /24 subnet
Input: 192.168.1.0/24
Output: Network, broadcast, mask, and usable address range.
What is a CIDR calculator for?
It helps review IPv4 ranges used in allowlists, firewalls, VPNs, subnets, and cloud security groups.
Does it support IPv6?
No. This version calculates IPv4 CIDR blocks only.
What is a usable address?
In traditional networks it excludes network and broadcast. For /31 and /32, the tool keeps the special block count.
Can I use it for cloud security groups?
Yes. Use the result to review ranges and masks before applying them in AWS, GCP, Azure, VPNs, or firewalls.
Is the CIDR sent to a server?
No. The calculation runs locally in your browser.
How do I use this tool safely?
Use the tool as a short workflow: review the expected input, run processing, and validate the output: Fields: IPv4 CIDR (text, required). Example workflow: 192.168.1.0/24 -> Network, broadcast, mask, and usable address range.. Enter the requested input, run the tool, and review validation messages or warnings before copying the result.
Which inputs and outputs should I check?
Check this tool's input fields, examples, and output before using the result: IPv4 CIDR (text, required). Use the fields, formats, and limits described in the tool interface; review the output before applying it to critical workflows.