IPv4 Subnet Calculator
A full IPv4 subnet calculator: network, broadcast, mask, and host count. Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
10.0.0.5 /26
Example Output
62 usable hosts, network 10.0.0.0
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the IPv4 Subnet Calculator
The IPv4 Subnet Calculator computes all details of an IPv4 subnet from an address and prefix: network, broadcast, subnet & wildcard mask, usable host range, total addresses, and usable hosts. It handles /31 and /32 (point-to-point and single-host special cases).
An essential tool for network admins to divide and plan address allocation.
FAQ
Is this IPv4 Subnet Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.