Do you know how many devices are connected to your wifi network right now? How many people in your home, office or building are carrying phones, tablets, laptops, and other things which are connected to your wireless LAN?
If you don't know, and you'd like to, a handy program from the always-excellent Nir Sofer, called Wireless Network Watcher, will tell you. To get it, head to http://www.nirsoft.net/utils/wireless_network_watcher.html for the download. The link is towards the end of the rather long page, just before the list of language translations available. The program is only 0.3 MB and it's malware-free according to VirusTotal and Web of Trust.
Go for the Zip file option, rather than the setup-enabled one. It's portable, so you just need to unzip the file and double-click the file. Within seconds, you'll have a list of all the machine names connected to your wireless, along with MAC addresses and manufacturer. So now you can track down any connections that you weren't initially aware of.
Wireless Network Watcher is free.
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