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WhoIsConnectedSniffer vs netdiscover: catalog facts
WhoIsConnectedSniffer	netdiscover
Free Freeware from NirSoft; it may not be sold or bundled with commercial products.	Free Free to download from its official repository.
Windows	Linux, Command line
Passive discovery that sends no packets to other devices Shows operating system, description and IPv6 address that scanners may miss	Active and passive ARP discovery Works on networks without a DHCP server
Requires the Npcap or Network Monitor capture driver Only detects devices that send packets the computer receives, and not on other subnets	Only discovers hosts on the local network segment Intended for authorized testing of networks you own or may scan
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
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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