Focused tool

CIDR tools

Split or aggregate IPv4 and IPv6 networks locally.

Run CIDR tools

View full JSON response

Examples

Use a validated example to fill the form and execute the exact input.

192.0.2.17/27
192.0.2.0/24

Usage and limits

Public network lookups use the canonical v1 JSON API with the existing input validation, timeout, response-size, rate, and SSRF controls. Local transformations remain in this browser.

API documentation: API reference. Canonical route: /api/v1/cidr/.