Tool overview
What is Subnet Calculator?
A Subnet Calculator is a tool that helps you calculate CIDR ranges, broadcast, and host counts.
Why use Subnet Calculator?
It improves readability and workflow speed when you need to calculate CIDR ranges, broadcast, and host counts—entirely in your browser with no server uploads.
Key Features
Instant syntax highlighting and error catching, client-side privacy, and one-click copy for subnet Calculator workflows. Calculate CIDR ranges, broadcast, and host counts
How to Use
Follow these steps to get accurate results from the tool interface above.
- Enter CIDR notation (192.168.1.0/24) or IP + mask.
- Read network, broadcast, first/last host, and usable host count.
- Use results for firewall rules, VPC planning, or interview prep.
CIDR Planning Specs
CIDR notation
Prefix length determines host bits—/24 yields 256 addresses, 254 usable hosts.
RFC1918 ranges
10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are private-use.
Broadcast address
Last address in subnet—typically excluded from assignable host pools.
Frequently Asked Questions
Expandable answers for common debugging bottlenecks and data privacy questions.
Official Documentation & References
Authoritative specifications and platform documentation for this utility.