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WhoIsConnectedSnifferAngry IP Scanner
Free

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

 Free

Free and open source under GPL v2.

Windows Windows, macOS, Linux
  • Passive discovery that sends no packets to other devices
  • Shows operating system, description and IPv6 address that scanners may miss
  • Scans a local network or an internet range, by range, random selection or an address file
  • Extensible through data fetchers for hostname, MAC address, ports and more
  • Requires the Npcap or Network Monitor capture driver
  • Only detects devices that send packets the computer receives, and not on other subnets
  • Needs a Java runtime, which the packaged builds bundle but the bare jar does not
  • The macOS build has been looking for a maintainer since 2019
Downloadable app Downloadable app
Closed source Open source
License: Freeware License: GPL-2.0
No account needed No account needed
Not stated if it works offline Works offline

Checked October 8, 2026

Checked September 20, 2026

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