What this tool does:

The VLSM Visualizer lets you drag network devices onto a canvas, connect them with cables, and then automatically divides your base network into subnets based on those connections.

How to use:

• Enter your base network in CIDR form (e.g. 192.168.0.0/24).
• Drag devices (routers, switches, PCs, etc.) from the toolbox onto the canvas.
• Click “Cable Mode,” then click two devices to connect them.
• Use “Delete Mode” to remove any devices or cables.
• When ready, click “Calculate Subnets.”
• View your subnets in the table and on the canvas (colored outlines and IP labels).
• Export the results to CSV if needed.

Network device icons provided by ecceman/affinity.