How to tell if someone is stealing your Wi-Fi — and what you can do about it

Everyone and their granny has a Wi-Fi connection in their home, but not all of them run as fast as you might like. While that might just mean you need a new router, it’s possible someone is thieving your connection, too. Fortunately, there are ways to detect it and block them from accessing it ever again.

As long as you have your MAC address and an app or two, you can determine if someone is stealing your Wi-Fi or if your connection is just slow. Here’s how.

Is someone stealing your Wi-Fi?

If you only have a few Wi-Fi devices in your house, you may want to unplug or turn them all off and then watch the wireless signal light on your router. If the light continues to flicker, someone else is using your Wi-Fi.

However, this method only works if you can be sure that every wireless-capable device you have is powered down, which may not be easy to do in many homes. So, we present two in-depth methods for checking for Wi-Fi thieves, no matter what setup you have. If you need a refresher on wireless networking itself, then check out our Wi-Fi overview.

Method 1: Use an app

A number of apps are available to provide automatic searches for unusual devices logged into your Wi-Fi network. Checking those devices, especially if they’re connecting at odd times of day when no friends are over, can provide valuable clues. Here are a few apps that can help you pinpoint problems.

Wi-Fi Thief Detector: This app is easy to download and designed to produce fast results. It will show you how many devices are on your router, help you spot devices that don’t belong there, and connect you with your router settings so you can quickly make the changes you need to protect your router (see below for more information).

Paessler PRTG Network Monitor: Paessler’s solution is a full suite of router management tools, including automatic detection of strange traffic, analysis of how the network is being used, and other in-depth tools. It may be a bit much for the average worried homeowner, but it’s an excellent tool for small businesses concerned about someone hopping on their network without permission. We suggest you stick with the 30-day free trial, which should be enough to root out any problems.

Wi-Fi GuardThis handy app, available for iOS and Android, has a pleasant minimalistic interface that allows you to check out all the devices on your network and look for anything suspicious. You can take a look at the details of any suspicious devices and get notifications about any new device that has just logged into your network.

Wireless Network Watcher: This independent software is designed to help Windows and MacOS users watch for suspicious wireless activity and monitor all currently connected devices.

Fing: Fing is an iOS download for more mobile-oriented protection. It allows you to immediately see connected devices, what type of devices they are, and the nature of their connection, MAC address, and so on. You can also check Wi-Fi connection behavior to note particularly busy times that could indicate someone else is hopping onto your network.

Method 2: Check administrator logs

If you suspect that someone is stealing your Wi-Fi, you need to log in to your router’s administration page. Most people can do this by typing or into the address bar. If these don’t work, swing on over to our guide for accessing your router’s admin panel.

Once you’ve accessed the admin page, you’ll need to locate the page listing the various Media Access Control (MAC) addresses connected to your computer. The location of this page will differ depending on your router, but you may find it under wireless configuration, wireless status, or in the DHCP client list. You can use this list to count how many devices are connected to your internet. If you see six MAC addresses — any device connected to your network will have its own unique MAC address — but only have four devices in your home, somebody is probably stealing your internet.

Note: Old phones, gaming consoles, Wi-Fi-enabled cameras, and other connected devices may show up on the MAC address list. You can get a better handle on which MAC address represents which device by using a website like

How to keep outsiders away


If you suspect someone is stealing your Wi-Fi, it’s a good idea to beef up security (penalties for Wi-Fi theft vary greatly, so consult local law enforcement for follow-up). If you don’t have a password on your network, add one. If you still use the default router name and password, change it — you can do this from the admin page on your router.

To change your password, look for the pre-shared key in your security settings. Changing your wireless password will kick off all current devices (including those unwanted freeloaders), so you’ll have to reconnect your devices once you have a new password.

To change your router name, locate the Service Set Identifier. This is typically found in the wireless settings menu. Look up more specific instructions for your specific brand of router if necessary.

Lastly, it’s important to use the strongest wireless network encryption available for consumers. At this time, though WPA2 may be the most commonly used, WPA3 is the strongest. So you may want to start thinking about getting a new one that features WPA3.

If your router is out of date, you may not find support for it any longer. In that case, you may not have access to security features like these. That — combined with the emergence of so much cool, modern tech — means it may be time to start thinking about getting a new router.

Remove strangers from your Wi-Fi

Securing your Wi-Fi connection is a crucial step in safeguarding your internet experience against potential hackers. You don’t want to commence securing your Wi-Fi if unknown users are leeching off your connection, so there is a simple protocol for ensuring that no strangers are using your Wi-Fi before starting the security procedure. Changing your password to a more robust code will automatically kick everyone off your network (including you). Sign in to your devices with the new password, and casual moochers won’t be able to log on. This simple password reset should be enough to rid your Wi-Fi of unwanted strangers, but you should always be vigilant, checking to see if any strange devices connect to your Wi-Fi at any given time.

If you can locate the offending device, there’s another way to block strangers from accessing your Wi-Fi. Look for an option on your router administration page that says MAC filtering, Device filtering, or something similar. With this setting, you can add MAC numbers to a list of blocked devices. Any device on the block list cannot access your router’s Wi-Fi signal. Do this by choosing any unknown MAC numbers and simply add them to the list. There are apps out there to make this process easier. Google Home makes it super simple to choose any device on your network and block it in a few easy steps. Just keep in mind that this doesn’t make the problem go away forever. Hackers can use different MAC addresses, but if you’re trying to keep squatters off your Wi-Fi, this should do the trick.

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