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Calculate network information from CIDR notation. Supports IPv4 and IPv6.
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
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Tool usage guide
The CIDR Calculator is a precise network utility designed to instantly derive essential subnet information from IPv4 and IPv6 CIDR notation. By entering your network address and prefix length, you can quickly determine the netmask, broadcast address, host range, and total number of available IP addresses.
Background
The administrator needs to divide a local network into smaller segments to improve traffic management.
Problem
Determining the exact host range and broadcast address for a 192.168.1.0/26 subnet.
How to use
Enter '192.168.1.0/26' into the CIDR input field.
Outcome
The tool displays the netmask (255.255.255.192), the usable host range (192.168.1.1 to 192.168.1.62), and the broadcast address (192.168.1.63).
Background
An architect is setting up a new IPv6 subnet for a data center deployment.
Problem
Calculating the network boundaries for a /64 prefix to ensure proper routing.
How to use
Enter '2001:db8:abcd::/64' into the CIDR input field.
Outcome
The tool provides the full network range and confirms the prefix length, ensuring the architect can correctly assign addresses to the new infrastructure.
Yes, the CIDR Calculator fully supports both IPv4 and IPv6 address formats.
It provides the netmask, network address, broadcast address, and the range of usable host IP addresses.
Yes, the tool calculates the subnet mask based on standard CIDR bit-length rules for any valid prefix.
Yes, the tool handles any valid CIDR notation, from small subnets to large network blocks.
No, this is a web-based utility that runs directly in your browser without requiring any installations.