Is Someone Stealing My Wi-Fi?

Acutis · plain-English network help · updated June 2026

The short answer

If your internet feels slower than it should and you spot a device on your network you can't account for, it's worth checking whether someone is piggybacking on your Wi-Fi. The reliable way to find out is to look at the list of devices connected to your router and match every entry to something you own. Anything left over is a candidate for an uninvited guest. The good news: even if someone is on your network, locking them out takes only a few minutes once you know what to do.

Signs someone may be on your Wi-Fi

• Unexplained slowdowns. If streaming buffers or downloads crawl at times when your own usage is light, a freeloader sharing your bandwidth is one possible cause.
• Devices you don't recognize. An unfamiliar phone, laptop, or "unknown" entry in your router's device list is the clearest red flag.
• Your router lights flicker when everything's off. If the activity light keeps blinking after you've put your own devices to sleep, something is still using the connection.
• Data caps hit sooner than expected. If your provider warns you're near a limit you didn't think you'd reach, someone else's traffic may be counting against you.

None of these is proof on its own — a background update or a forgotten smart device explains most of them. The device list is what settles it.

How to check your device list

1. Log into your router. Open a browser and go to your router's address — usually 192.168.0.1 or 192.168.1.1. (See how to find your router's IP address.)
2. Open the connected-devices page. It may be called "Attached Devices," "Device List," or "DHCP Clients."
3. Account for every entry. Walk down the list and tick off each phone, laptop, TV, console, speaker, thermostat, and smart plug you own. Anything you can't place is the one to investigate.

Intruder, or just your own gear?

Most "mystery" devices turn out to be something you own with an unhelpful name. Before you panic:

• Check the manufacturer. Every device's MAC address starts with a code identifying its maker. Look it up with our free MAC vendor lookup — a name like "Amazon" or "Google" usually points to a smart speaker or streaming stick, not a stranger.
• Count your invisible devices. People routinely forget IoT gadgets: a smart bulb, a robot vacuum, a doorbell, a printer. These all show up as separate devices.
• Test by elimination. Unplug a suspect-looking device and refresh the list. If a mystery entry disappears, you've identified it.

If an entry stays after you've accounted for everything you own — and its maker doesn't match any of your gadgets — treat it as a possible intruder and lock things down.

How to lock down your Wi-Fi

Whether or not you found a stranger, these steps shut the door for good:

1. Use WPA3 or WPA2 encryption. In your router's wireless settings, make sure security is set to WPA3 (or WPA2 if WPA3 isn't available). Never use the old, broken WEP or run an open network.
2. Set a strong Wi-Fi password. Use a long passphrase — several random words is ideal. Avoid your address, phone number, or anything guessable.
3. Change the password now. Changing it instantly kicks every device off the network, including any intruder. You'll re-enter the new password on your own gear; they can't.
4. Change the router admin password too. The login for the router's settings page should be different from the default printed on the sticker.
5. Set up a guest network. Put visitors and smart-home gadgets on a separate guest Wi-Fi so they never touch your main network.