What are you documenting?
Pick the view that fits — you can switch anytime, nothing is lost.
Nobody ever wrote this network down.
Draw it once, and it checks itself.
Every device, every subnet, every cable — with the address conflicts, loops and dead gateways found for you, and a report you can hand over. It runs in this tab — no server, no upload, no account — which is why it still works in a comms room with no signal.
Start a new network
A blank canvas that has its own link from the first device.
Or drop a .nettopo build file, or a whole binder, here.
First time here? Start from something that already exists.
Networks you save are kept in this browser, and show up here.
Your networks
Saved networks live in this browser only — this is not an account, and clearing site data removes them. Export the binder for a copy that survives.
What do you have?
Count what's in the building — the network draws itself. You can rename and adjust everything afterwards.
Site report
The findings, the inventory and the diagram as one printable document. Everything here is optional — it only fills in the header.