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Network tools
Plan IPv4 subnets and convert CIDR notation without sending anything online.
What these tools accept
- An IPv4 address in CIDR notation (for example 10.0.0.5/16). A bare address defaults to /32..
- A dotted-decimal mask (255.255.255.0), a prefix with slash (/24), or a bare prefix (24)..
Local processing
- Every tool on this page runs inside your browser.
- Your inputs are not uploaded, and nothing is kept after you close the tab.
- Each page lists its own size and shape limits.
Choosing a tool
- Open a tool page to read what it keeps and what it cannot do.
- Tools that cannot handle an input say so instead of returning a partial result.
- Each page links to the tools people usually pair with it.
How to use these network tools
- Pick the tool that matches the job you need done.
- Fill in the inputs the page explains, and run it.
- Download the result. Nothing leaves your device at any point.