Before you start
- Access to your router’s app or admin page
Method 1 Block a specific device
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Step 1: Open connected devices
In your router app (TP-Link Tether/Deco, Google Home, eero, Netgear, ASUS, Huawei AI Life) open Clients/Devices. In a browser admin page, look for Attached Devices, DHCP Clients or Device List.
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Step 2: Identify the device
Names like “Galaxy-A54” or “iPhone” help. Compare MAC addresses with your own devices (shown in each device’s Wi-Fi settings).
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Step 3: Block it
Tap the device and choose Block, Pause or Add to blacklist. It’s disconnected and can’t rejoin.
Method 2 Change your Wi-Fi password (most effective)
Blocking by device can be dodged with a different device or a randomised MAC address. A new password can’t.
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Step 1: Open wireless settings
In the router app or admin page, open Wireless/Wi-Fi settings.
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Step 2: Set a new password
Choose a new strong password and WPA2/WPA3 security, then save.
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Step 3: Reconnect your devices
Everyone is disconnected; only people you give the new password to can rejoin.
Method 3 Allow only your devices (MAC filtering)
This takes upkeep (every new device must be added), and phones use private MAC addresses per network. It’s a useful extra layer, not a replacement for a strong password.
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Step 1: Find MAC filtering
Look for MAC Filtering, Access Control or Wireless MAC Filter.
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Step 2: Choose allow list
Switch to Allow/Whitelist mode and add your own devices. Everything else is blocked.
Troubleshooting
I blocked my own device by mistake
Connect with a cable or another device, open the block list and remove it.
The unknown device keeps coming back
Change the Wi-Fi password and turn off WPS. Check your router admin password hasn’t been changed by someone else.
Frequently asked questions
Will the person know they were blocked?
They’ll just see they can’t connect or have no internet. Routers don’t send notifications.
Is it illegal for someone to use my Wi-Fi without permission?
In many countries, using a network without permission is an offence. Securing your network is the practical solution.
Summary
Block the device in your router’s device list, then change your Wi-Fi password to keep everyone you don’t trust off for good. Use a guest network for visitors and turn off WPS.
