Subnet Calculator
IPv4 CIDR ranges, masks and host counts. This tool runs entirely in your browser: nothing you paste or upload leaves your device.
What Subnet Calculator does
Subnet Calculator sits in the Network section of Toolbox, alongside 6 related tools. It opens instantly at https://jsglobe.com/apps/subnet-calculator/, keeps working offline once the page has loaded, and stores anything you save in this browser rather than on a server.
Also useful for: subnet, cidr, ipv4, netmask, network.
How it works
- Open the page and start using it. There is no account, no sign up and no paywall.
- Everything runs as JavaScript in your own browser, so your input never reaches a server.
- Settings and saved work live in this browser and can be cleared at any time.
- The whole site is open source at https://github.com/samalstudios/jsglobe.
Questions
- Is Subnet Calculator free?
- Yes. Subnet Calculator is free to use, with no account, no sign up and no usage limits.
- Does Subnet Calculator upload my data?
- No. It runs entirely in your browser, so the text, files and images you give it never leave your device.
- Does Subnet Calculator work offline?
- Yes. Once the page has loaded, the tool keeps working without a connection.
- Where can I find the source?
- Toolbox is open source at https://github.com/samalstudios/jsglobe.
Related tools
- IP Converter - IPv4 in decimal, hex, binary and octal
- MAC Address - Generate and reformat MAC addresses
- DNS Lookup - Dig style record lookups over DNS-over-HTTPS
- Speed Test - Measure download, upload, latency and jitter
- Domain Lookup - RDAP records for a domain, IP or network
- WebSocket Tester - Connect to a socket and watch the frames