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WhoIsConnectedSnifferWireless Network Watcher
Free

Freeware from NirSoft; it may not be sold or bundled with commercial products.

 Free

Freeware from NirSoft with no paid tier.

Windows Windows
  • Passive discovery that sends no packets to other devices
  • Shows operating system, description and IPv6 address that scanners may miss
  • Shows the adapter manufacturer to help identify each device
  • Background scan with alerts for new devices
  • Requires the Npcap or Network Monitor capture driver
  • Only detects devices that send packets the computer receives, and not on other subnets
  • Can only scan the wireless network you are currently connected to
  • Built-in MAC vendor database may lag behind new assignments
Downloadable app Downloadable app
Closed source Closed source
License: Freeware License: Freeware
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 8, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.