LANScan

Local-only inventory of every device on your LAN, every USB device, every driver - live dashboard, zero telemetry

Windows / Linux / macOS Python Network Security
Live Demo

LANScan maps your network, your USB bus and your driver table, then renders it as one live dashboard that never leaves your machine.

Open the live dashboard Download the app

The dashboard is a browser view; the scanner is a native service. The page cannot send ARP or ICMP itself, so it needs the standalone build running on the host you want to inspect. Releases: Windows · macOS · Linux, no Python needed.

This is also the canonical home of the dashboard’s source. It used to live in a separate neohiro/lanscan.github.io repository, which existed only to hold it before the path /lanscan/ was available on this site; that repository is retired. GitHub serves a repo named <name>.github.io from <owner>.github.io/<name>.github.io/, so it could never have served /lanscan/ in the first place — and two copies of a live dashboard is two that drift.

The dashboard

https://neohiro.github.io/lanscan/

Ordered by how you actually troubleshoot, broadest blast radius first:

# Section What it answers
1 LAN devices who is on the network, who is the gateway, who just appeared
2 USB devices ports, IDs, serials, link speed, bound driver
3 Drivers & system drivers version, provider, date, signature state
4 Host & system resources CPU, memory, disks, throughput, uptime
5 Tests ran every probe this cycle, including the ones that found nothing

A fail in section 5 usually explains a suspiciously short row above it, so the test log is data rather than noise.

Copying raw data

Built for pasting into a terminal, a ticket, or a spreadsheet.

Action Result
Left-click a value that value only, with a tooltip naming the class — IP copied!, MAC copied!
Right-click a row the entire record, key: value aligned
Shift + left-click same as right-click, for trackpads with no second button

The EXPORT button on the bay bar downloads the snapshot as JSON and copies it to the clipboard in one action.

Privacy

Not a disclaimer, an enforced property:

  • No third-party requests. No CDN, no webfont, no analytics, no telemetry. CI fails the build if any shipped file gains an external reference.
  • Loopback only. The service binds 127.0.0.1, so a snapshot is not reachable from your LAN or by a guest on the same Wi-Fi.
  • localStorage only. Two keys. That is why a refresh keeps your data and why RESET genuinely clears it.
  • Self-reported. Every snapshot carries a privacy block naming the hosts the process contacted and what it is bound to. The dashboard shows you instead of asking you to trust it.

Install

Download a standalone build from the Releases page — no Python needed — or run it from source:

pip install scapy     # optional: needed for active sweeps
python -m lanscan serve

# common flags
python -m lanscan serve --iface eth0 --port 8787 --interval 2
python -m lanscan scan --json          # one snapshot to stdout
python -m lanscan serve --no-update-check

How it finds things

Active ARP sweeps catch everything on the subnet, including hosts that ignore multicast. Passive capture and mDNS / SSDP / WS-Discovery add devices that never answer a sweep and, more usefully, give them a name. MAC prefixes are resolved against an offline OUI table, and PCI / USB identifiers against the pci.ids and usb.ids databases — all local lookups, no API calls.

This tool is free and open source. Support the developer: