PortFinder
Network switch port discovery tool using CDP / LLDP / MNDP.
winget install --id=packetThrower.PortFinder -eDescription
PortFinder identifies which switch, switchport, and VLAN your machine is currently plugged into by listening for the discovery packets the switch is already broadcasting. No agent on the switch, no SNMP, no login — just a passive 30-second listen on the wire. Supported protocols: - LLDP (universal: Aruba, HP, Juniper, Extreme, Cisco, MikroTik) - CDP (Cisco) - MNDP (MikroTik RouterOS fallback) Ships a desktop GUI and a headless CLI in one binary. The CLI takes `portfinder capture --interface <NIC> --protocol LLDP [--json]`. Requires Npcap (with "Allow non-administrators to capture" enabled) for non-administrator capture.
PortFinder is available through winget as package ID packetThrower.PortFinder, with version 4.1.2. Use the install command above to set it up on Windows without downloading a separate installer manually.
packetThrower.PortFinder
portfinder
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