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Network switch port discovery tool using CDP / LLDP / MNDP.
$ winget install --id packetThrower.PortFinder --exact --version 4.1.2Run in Command Prompt, PowerShell, or Windows Terminal. Prompts for any agreements.
PortFinder uses MSI (WiX). The silent install switches are /quiet /norestart.
msiexec.exe /i PortFinder_4.1.2_amd64_en-US.msi /quiet /norestart
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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.
Copy a command tailored to that specific architecture, type, and scope - useful when winget would otherwise pick a different default.
No known CVEs for PortFinder.
Coverage is best-effort and depends on a winget package mapping to an NVD CPE entry. Absence here is not a guarantee of safety.
More from packetThrower or browse cdp, discovery, lldp.