If your internet has suddenly become slow or you notice unusual activity on your network, you may wonder whether someone else is using your WiFi without permission. Learning how to know someone else is using your WiFi can help you identify unfamiliar devices and protect your internet connection. Your router normally keeps a list of devices connected to the network, making it possible to compare connected devices with the phones, laptops, televisions and other equipment in your home.
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Check for Unusually Slow Internet
One of the first signs that someone else may be using your WiFi is a noticeable reduction in internet speed. If your connection is normally fast but suddenly becomes slow, an unfamiliar device could be consuming part of your available bandwidth.
However, slow internet does not automatically mean someone is using your WiFi. Network congestion, router problems, weak signal strength and problems with your internet provider can also cause slow speeds.
Run an internet speed test at different times and compare the results before assuming there is an unauthorized user.
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Check the Connected Devices on Your Router
The most reliable way to find out which devices are using your WiFi is to check your router’s connected-device list.
Open your router’s official app or administration page and look for a section called Connected Devices, Device List, Clients, Wireless Clients, Attached Devices or DHCP Clients.
The exact name depends on your router model and software. The list may show device names, IP addresses, MAC addresses, connection types and other information.
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Compare the Devices With Your Own Equipment
Once you open the connected-device list, compare every entry with the devices you own.
Think about all the equipment that may use your WiFi, including smartphones, laptops, tablets, smart TVs, printers, gaming consoles, security cameras, smart speakers and other smart-home devices.
If you have five devices in your home but the router shows eight active devices, investigate the additional entries before assuming they belong to strangers.
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Look for Devices You Do Not Recognize
An unfamiliar device name can be a warning sign, especially if you cannot match it to anything in your home.
For example, you might see a generic Android device, an unknown computer name or a manufacturer name that you do not recognize.
Do not immediately assume that an unfamiliar name means someone has hacked your WiFi. Modern phones can use private or randomized WiFi addresses, and some routers display generic names for legitimate devices.
Check your own devices carefully before taking action.
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Turn Your Devices Off One at a Time
If you cannot identify a device on the router’s list, you can try a simple identification method.
Turn off the WiFi connection on your phones, laptops, televisions and other devices one at a time. Refresh the router’s connected-device list after each change.
When an entry disappears, you can determine which device it belongs to.
This can help you distinguish your own equipment from a genuinely unfamiliar device.
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Check Your Router’s Recent Activity
Some routers keep information about devices that have recently connected, even after they disconnect.
Look for sections such as connection history, recent devices or network activity if your router provides them.
Pay attention to devices marked as currently online or active rather than assuming every device in a historical list is using your WiFi at that moment.
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Check the WiFi Password Security
If you discover a device that you are confident does not belong to you, consider whether your WiFi password may have been shared with someone else.
This can happen when you give the password to visitors, neighbours, friends, technicians or other people who later connect their devices.
Changing the WiFi password is one of the simplest ways to remove people who are using the old password. After changing it, your own devices will also need to reconnect using the new password.
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Use a Stronger WiFi Password
If you suspect unauthorized access, create a strong password that is difficult for others to guess.
Avoid using simple passwords based on your name, phone number, house number or common words.
Use a combination of letters, numbers and symbols where supported. Also avoid sharing the new password unnecessarily.
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Secure Your Router
Your WiFi password is not the only security setting that matters. Your router also has an administrator password used to access its settings.
Change the router’s administrator password if it is still using a default or easily guessed password.
Where supported, use a modern WiFi security option such as WPA3 Personal or WPA2/WPA3 mixed mode when older devices require compatibility.
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Check the Guest Network
Your router may have a separate guest network. Devices connected to the guest network can sometimes appear separately from devices connected to your main network.
Check both the main network and guest network if your router provides them.
If you do not need the guest network, consider disabling it or securing it with a separate password.
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Block an Unauthorized Device if Necessary
Some modern routers allow you to pause, block or deny a device directly from the connected-device list.
If you have confirmed that a device does not belong to you, you can use this option if your router supports it.
However, blocking one device may not be enough if someone knows your WiFi password. Changing the WiFi password is generally a more reliable way to remove unauthorized wireless users.
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Monitor Your WiFi After Changing the Password
After securing your network, check the connected-device list again.
Reconnect only your authorized devices and monitor the list over the next few days.
If an unfamiliar device appears again, review your router’s security settings and make sure the new password has not been shared.
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