PortFinder packetThrower

cdp discovery lldp mndp network networking npcap packet-capture pcap switch vlan

Use this command to install PortFinder:

winget install --id=packetThrower.PortFinder -e

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.