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Full device inventory
IP, MAC, manufacturer, hostname and device type for every device, whether it is a PC, phone, printer, camera or smart TV.
For office IT · Windows 10 & 11
Know every device on your office network.
Net Watcher lists everything connected to your network with its IP, MAC address and manufacturer, flags devices nobody approved, warns about IP conflicts and keeps a record of every internet outage.
Everything an office IT person needs to see
One window that answers "what is on my network right now, and is it supposed to be there?"
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Spot outsiders instantly
Register the office's own devices once. Anything new or unapproved is highlighted in red and pops a Windows notification.
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IP conflict warnings
Reserve IPs for printers and servers. Net Watcher warns when another device takes one, or when two devices keep fighting over an address.
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Visual IP map
All 254 addresses at a glance: free, in use, reserved or in conflict. Pick a free IP for a new device in seconds.
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Critical device alerts
Mark the printer, the camera recorder or the server as critical. They are checked every minute and you are told the moment one stops answering.
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Internet outage log
Response time charts and an outage history that tells "the operator's internet is down" apart from "our router is down". Export it as evidence.
Take a look inside
An interactive preview with sample data. Click the tabs, hover the map and the chart.
Net WatcherNet Watcher
Ethernet · This PC 192.168.0.14/24 · Gateway 192.168.0.1 · Scanning 192.168.0.0/24
Scan nowExport CSVSettings
0Online
0Unknown online
0Conflicts
0Approved
0Registered
| IP | Name | Type | Manufacturer | MAC | Owner | Approved |
|---|
FreeApproved device
Unknown deviceReserved (offline)
Router / this PC
Hover an address to see who uses it.
✔ Up · 9 msInternet
✔ Up · 1 msRouter (office network)
99.3%Internet uptime, last 24 h
1Outages, last 7 days
Response time, last 24 hours
Internet
Router
No internet reply
| Outage | Started | Duration |
|---|---|---|
| Internet down (router OK) | — | — |
Non-invasive by design
Net Watcher only uses the questions every device on a network already answers. Nothing is installed on the devices, and no traffic is read.
- Discover. A fresh ARP request and a ping to every address in the subnet. Phones that ignore ping still have to answer ARP.
- Identify. The manufacturer comes from the public IEEE registry; names from NetBIOS, mDNS/Bonjour and the router's DNS; the device type from a few well-known service ports.
- Compare. Each device is matched against your registry of approved devices and reserved IPs.
- Alert. Unknown devices, conflicts, critical devices going down and internet outages raise a Windows notification and are logged.
Use it responsibly. Run Net Watcher only on networks you own or administer, and let the people using the network know devices are inventoried, as your company policy and privacy law (such as LGPD or GDPR) require.
Download Net Watcher
Free for Windows 10 and 11 (64-bit). Nothing else to install.
Installer
Adds Start menu and desktop shortcuts and can be uninstalled from Settings → Apps. Installing a newer version upgrades in place and keeps your data.
Download .msiPortable
A single file you can run from any folder or a USB stick. Nothing is installed. Both versions share the same data.
Download .exeThe download list could not be loaded right now. Please try again in a few minutes.
Seeing "Windows protected your PC"? The app is not code-signed yet, so Windows SmartScreen asks before running it the first time.
Click More info → Run anyway. You can check the file is genuine by comparing its SHA-256 checksum above.
Requirements
- Windows 10 or 11, 64-bit
- A PC connected to the network you want to monitor (cable recommended)
- No administrator rights and no extra drivers needed
Questions
Does it slow down the network?
No. A full scan of a 254-address network takes about ten seconds and sends a few small packets per address. Health checks send a handful of pings per minute.
Why do some phones show "Private MAC"?
Modern iPhones and Android phones use a random MAC address per Wi-Fi network for privacy, so there is no manufacturer to look up and the address may change. For staff phones, turn off "Private Wi-Fi address" for the office network so they stay recognized.
Can it block a device?
No, on purpose. Blocking from a PC would mean interfering with network traffic. Use your router's MAC filter, or give visitors a separate guest Wi-Fi.
Can it tell which switch port a device is plugged into?
Not yet. That needs a managed switch with SNMP. It is on the roadmap.
Where is my data stored?
Only on your PC, in %LOCALAPPDATA%\NetWatcher, with an automatic weekly backup. Uninstalling keeps it; delete the folder to remove everything.
Does it need to stay open?
Closing the window keeps it running in the system tray, and it can start automatically when you sign in to Windows (Settings → Start with Windows).