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WhoIsConnectedSnifferSoftPerfect Network Scanner
Free

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

 Paid

Commercial software with licences sold through the SoftPerfect website.

Windows Windows, macOS, Linux
  • Passive discovery that sends no packets to other devices
  • Shows operating system, description and IPv6 address that scanners may miss
  • Queries devices over WMI, SNMP, HTTP, SSH and PowerShell
  • Supports both IPv4 and IPv6
  • Requires the Npcap or Network Monitor capture driver
  • Only detects devices that send packets the computer receives, and not on other subnets
  • Paid licence required
  • Closed source
Downloadable app Downloadable app
Closed source Closed source
License: Freeware License not stated
No account needed No account needed
Not stated if it works offline Works offline

Checked October 8, 2026

Checked September 23, 2026

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