The first-aid kit for networking.
Subnet, plan VLSM layouts, and generate wildcard masks in seconds. Free, open source, and fully offline.
Built for every layer of the stack
From subnetting to wildcard generation — everything in one place, offline.
Subnet Calculator
Instantly compute network address, broadcast, host range, and usable host count from any IP/prefix pair.
VLSM Planner
Design variable-length subnet masks for multi-department networks. Assign the right-sized subnet to every segment without wasting addresses.
Wildcard Masks
Generate ACL-ready wildcard masks from any prefix length in one tap. Perfect for router and firewall configuration.
Free & Open Source
MIT licensed. No ads, no tracking, no paywall. Inspect, fork, or contribute on GitHub.
Works Offline
No account, no API calls, no internet required after install. All computation runs locally on your device.
Download NetKit — free, forever.
Available on Android. No account. No ads. Just the tools.
