How to use IP Range to CIDR Converter
Get the best out of IP Range to CIDR Converter: every option explained, a worked example, and what to check when the output is not what you expected.
Updated July 31, 2026
What it does
Compress lists of individual IP ranges back into optimized CIDR blocks. It runs entirely in your browser — your input never leaves your device.
Options
Every setting this tool exposes, straight from the code that validates it.
| Option | Type | Default | What it does |
|---|---|---|---|
startIp | text | 192.168.1.0 | Start IPv4 address. Defaults to 192.168.1.0. |
endIp | text | 192.168.1.15 | End IPv4 address. Defaults to 192.168.1.15. |
Worked example
Run these settings on the tool page:
startIp:192.168.1.0endIp:192.168.1.15
You get:
192.168.1.0/28
Getting the result you want
Most of the control here is in the options above. If the output is not what you expected, the setting to check first is startIp and endIp — those change the shape of the output rather than the input it accepts.
Troubleshooting
- It is slow on very large input. Everything runs in your browser, so speed depends on your device. Very large inputs are best split up, or run through the API where the work happens on our servers.
Automating it
The same logic is available as a REST endpoint, so you can run it from a script, a CI job or your own app.
Bashcurl "https://api.toolsxpo.com/v1/ip-to-cidr" \ -H "Authorization: Bearer $TOOLSXPO_KEY"
It costs 1 credit per successful call. See the full endpoint reference, or try it in the playground.
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