Wireless Network Watcher from Nirsoft is a free utility that scans your wireless network and displays the list of all computers and devices that are currently using your wireless network.

Network Tool - Wireless Network Watcher

The IP address, device name, MAC address, and network adapter manufacturer is displayed for each computer or device that is connected to the wireless network.

Wireless Network Watcher let you export the connected devices list into html/xml/csv/text file, or copy the list to the clipboard and then paste into Excel or other spreadsheet application.

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