Need to format JSON from an API response? The Wivrix IP Subnet Calculator is free, works in your browser, and takes seconds to use.
What this tool does
Calculate IP subnets, CIDR ranges, network addresses and host ranges. Free, instant, runs in your browser.
Why use Wivrix?
Many online tools ask you to sign up, add a watermark, or upload your files to a server you cannot see. Wivrix is different:
- Private by design — Everything runs in your browser. Your files and input stay on your device — nothing is uploaded to Wivrix.
- Free — no account, no paywall, no file-size tricks
- Fast — open the page and start working
Step-by-step guide
- Enter an IP address with or without CIDR notation (e.g. 192.168.1.0/24 or 10.0.0.1 ).
- The calculator instantly shows network address, broadcast, subnet mask, host range and more.
- /8 — Class A (16,777,216 hosts)
- /16 — Class B (65,536 hosts)
Common uses
- Format json from an api response
- Decode a jwt during debugging
- Test a regular expression quickly
- Convert yaml config to json
Frequently asked questions
Do I need an account?
No. Open the tool and use it straight away.
Is the IP Subnet Calculator really free?
Yes. Wivrix tools are free to use. The site is supported by ads that load only after you consent.
Is my data safe?
Everything runs in your browser. Your files and input stay on your device — nothing is uploaded to Wivrix.
Try it now
Open the free IP Subnet Calculator and follow the steps above. If this guide helped, bookmark the tool or share it with someone who needs the same job done quickly.
Related tools
- IP Address Info — see also our guide
- DNS Lookup — see also our guide
- Number Base Converter — see also our guide
Ready to try it? Open the free IP Subnet Calculator — no sign-up needed.
Open IP Subnet Calculator →