How do I know if someone is using my WIFI?

I have WIFI in my house and I am the only one who uses it. How would I know if someone else is using it?

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on the configuration page it shows what computers are connected If you can, password protect your wifi and dont broadcast the SSID name. If they cant see it they cant hack it.
Thing is, you can get a program that allows you to see the connection even if the SSID is not being broadcasted easily on the internet.
Aside from setting up WPA to require a password (which everyone with WIFI should use), almost all routers can be easily configured to keep a log of authenticated MAC addresses, times, and IP addresses accessed.  I would recommend also setting up MAC filtering to only accept your computer(s); it's yet another way to prevent interlopers.

Those who hijack WIFI connections range from the relatively benign (bridging connections for extra bandwidth) to those looking for an IP address to carry out malicious activity (hacking, virus propagation, identity theft, illegal downloading, &c).  Do everything you can to thwart this as if they do something stupid, you're the one who gets busted.
When you get on the net one day and all the advertisements seem to target someone who is not you.
Big Brother has sometihng to say...

It's kind of weird how that works, eh!
Kiteman8 years ago
Switch it off and listen for the cursing.
Sandisk1duo8 years ago
Use WPA, WPA2 encryption, you need 1 million years to crack the password make sure you use a custom password, because most wificracking passwords have key lists built in. as to who is n your wifi right now, look for a blinking light on your router when all the computers in your house are off, that usually tells that someone is using your WiFi
Password it, following the instructions that came with your wireless router. That will reduce the chances of anyone else using it by far. A good password will turn away most of the people trying to get in, and the few who are determined and knowledgable are going to get in anyway. Most routers will show connected devices somewhere on their configuration pages. Again, refer to the manual. You can usually disconnect and ban computers from the same interface. Any computer names that don't match the devices in your home can go. While you're at it, change the password on your router to something strong (a longer password with a good mix of lowercase, uppercase, symbols and numbers). Doing this should at least prevent anyone from changing your settings or erasing router logs to cover their tracks.