Promiscuous Mode Scanner

Demo
Request a NetScanTools Pro demo here.

Warning:
NEVER scan a computer you do not own or have the owner's permission to scan.

Promiscuous Mode Scanner Tool Description

This tool actively scans your subnet with modified ARP packets and shows the devices responding to each type of ARP packets. The devices that respond to nearly every packet are most likely listening in Promiscuous Mode (ie. the ethernet interface is capturing IP packets not intended for that IP address). All IPv4 devices MUST respond to ARP whether or not they are running a firewall. Note that ARP is not routed so you are limited to your subnet.

The image below shows a DSL router in the first row listening in Promiscuous Mode which would be expected from this type of device.

Note that the scanner requires the use of WinPcap. We install WinPcap as part of the installation package. WinPcap is designed for wired ethernet cards, not modems and it may or may not work with wireless interfaces.

Windows Vista compatibility: Fully functional as of v10.42.

Screenshot

Promiscuous Mode screenshot