NetCalc

A new approach to a subnet calculator. Begin with the cheat sheet then dive right in to subnetting from there. Built with a modern UI this is the subnet calculator you've been looking for.

NetCalc is a fast, offline CIDR and subnet calculator built for network engineers, sysadmins, and IT professionals.

Enter any IPv4 address and prefix length to instantly see the network address, subnet mask, wildcard mask, broadcast address, first and last usable hosts, and total host count. No internet connection required all calculations run entirely on-device.

FEATURES
* CIDR calculator _ full subnet breakdown at a glance
* Subnet splitting _ divide any network into equal subnets and list them all
* Previous / Next navigation _ step through adjacent networks without retyping
* History _ every calculation saved automatically; swipe to delete Cycle list star any history entry to add it to your quick-access IP defaults
* Cheat sheet _ common prefix sizes and their host counts at a glance
* IPv4 converter _ decimal, binary, and hex views of any address
* Onboarding tour _ guided walkthrough of every feature

PRO UPGRADE (one-time purchase)
* Remove all ads
* Custom cycle-list IPs beyond the built-in defaults
* Choice of UI colour themes

NetCalc is designed to stay out of your way: no account, no sign-in, no cloud sync, no tracking. Open it, get your answer, close it.

Something not quite right? Send feedback to [email protected] and it will be reviewed, promise.