Network Diagram Tool
Map servers, switches, firewalls and links.
Try it: Map a small office network
- Open the network template and identify the connection to the outside network.
- Rename the network devices and add the endpoints you want to document.
- Label links and check that each endpoint has the intended connection.
This is manual documentation. No network scan is performed and no connectivity is tested.
About Network Diagram Tool
Network documentation is the thing everyone agrees should exist and nobody has, until an outage makes its absence expensive.
Routers, switches, firewalls, servers, clients and the links between them.
How Network Diagram Tool works in your browser
The stencil is a set of labelled, colour-coded shapes — router, switch, firewall, server, client, wireless access point and an internet cloud — rather than vendor icon artwork. Keep the labels: network diagrams are read under pressure by people who did not draw them, and a named box is unambiguous.
Connections can carry labels for interface, VLAN or address, and those labels are usually the reason the diagram is being consulted at all — a topology with no addressing tells you what connects to what but not where to look.
It stays on your machine. A network diagram names your internal addressing, your segmentation and your security appliances; it is among the most useful documents an attacker could obtain, and uploading one to a free diagramming service is a genuine exposure rather than a theoretical one.
When to use it
Documenting an office or data-centre topology before you need it. Planning a segmentation or addressing change. Producing network documentation for an audit or a compliance requirement. Handing over infrastructure knowledge when someone leaves.
Frequently asked questions
Which devices are in the stencil?
Routers, switches, firewalls, servers, clients and wireless access points — enough to document most topologies without hunting for icons.
Can I label the links?
Yes. Connections can carry speed, VLAN or subnet annotations, which is what makes a topology diagram useful during an incident rather than merely decorative.
Can I keep editing it later?
Yes. Export to JSON and reopen it when the network changes, rather than redrawing from scratch.