| Label | Network | Usable Range | Broadcast |
|---|---|---|---|
| Click run to compute ranges | |||
Our free IP Subnet Planner & Calculator provides a professional, high-performance solution to divide network ranges, configure subnet spaces, and allocate CIDR hosts client-side securely directly within your browser. Engineered for maximum speed and absolute privacy, the tool operates entirely on the client side using secure local JavaScript processing—meaning your data never leaves your device and is never uploaded to any external server. Whether you are working on a desktop, tablet, or mobile phone, the responsive and premium interface delivers instant real-time results with zero wait times. Designed for daily productivity, it features fully configurable parameters, robust input verification, and offline capability to ensure a seamless, secure workflow.
Provide your base code or variables configurations to get started.
Configure the parameters, rulesets, or selectors with visual fields.
Preview the live outputs and save the results locally with one click.
Validates site sitemaps, decodes JSON web tokens, encodes URLs, and parses raw system user-agent signatures locally.
Choose custom indentation spaces, select Unix chmod octal checkmarks, and configure cron schedule timing intervals easily.
Validate structures and run formatting scripts safely in-browser. No keys, scripts, or security configurations are ever transmitted.