How to Tell If Someone Is Using Your Wireless Signal
A wireless local area network links computers and peripheral devices via radio waves instead of cables. For many home and small-business networks, the heart of the wireless network is a router to which other computers connect and which mediates security and Internet access. Most wireless networks are password protected to prevent intrusion by outsiders who might hijack your wireless signal. Nevertheless, you may wish to monitor what computers are using your network.
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Instructions
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Connect your computer to your wireless network, open your Web browser and enter the Internet Protocol (IP) address of your router into the URL location field. Most routers will use the IP address 192.168.1.1. You can refer to your router's manual to confirm this. Press "Enter" to visit your router's administration Web page.
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Enter the router administrator's user name and password, which would have been established during installation.
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Find a menu entry for the "DHCP Clients Table." Usually, this can be found in options behind a menu entry like "Local Networks" or "Wireless Networks." The table is a list of all computers and devices connected to your wireless network. Scan the list for equipment that does not belong to you. If you find a foreign device, it is likely that someone else is currently using your wireless signal.
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