CIDR Calculator
Calculate CIDR subnet details with the free CIDR Calculator. Enter an IPv4 address with its prefix length to find the corresponding network address, subnet mask, broadcast address and host range. Use the output for subnet planning, routing configuration and network troubleshooting. Remember that usable host counts can differ for special prefix lengths and network use cases.
Broadcast: 192.168.1.255
Usable hosts: 254
What is CIDR Calculator?
Calculate IPv4 network details from CIDR notation with the free CIDR Calculator. Enter an IPv4 address and prefix length to determine the network address, subnet mask, broadcast address and host range. Use the results to plan subnets, review routing settings and troubleshoot network configurations. Account for special prefix lengths and network-specific rules when determining usable host addresses.
Why use this tool?
- Create configuration files from a few choices instead of writing them from scratch.
- Reduce syntax mistakes in YAML and server settings.
- Get a starting point you can adapt to your environment.
How to use CIDR Calculator
- Step 1. Choose the options for your setup.
- Step 2. Review the generated configuration.
- Step 3. Copy it into your project and test it in a safe environment first.
Common use cases
Important notes
- Generated configuration is a starting point, so review it before deploying.
- Never include real secrets or passwords in generated files.
- Syntax and defaults can differ between tool versions.
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CIDR Calculator FAQ
What is CIDR Calculator?
Calculate IPv4 network information from a CIDR prefix, including network address, broadcast address, subnet mask and usable host range.
Do I need an account to use CIDR Calculator?
No. You can use it without creating an account.