How to disconnect someone from your Wi-Fi on a Samsung Galaxy A51: all the working methods

Have you noticed your Wi-Fi has slowed down, or an unfamiliar device has appeared in the list of connected devices? Or do you simply want to restrict network access for a specific user? From your phone Samsung Galaxy A51 This can be done in several ways - either through the router settings or using specialized applications. It is important to understand that disabling other people's devices It's not always possible to do this directly from your phone, but we'll show you some workarounds that will work 90% of the time.

In this article you will find:

• 🔍 How to check who is connected to your Wi-Fi
• 📱 Methods for disabling via phone Samsung A51 (including hidden Android features)
• ⚙️ Configure your router to block devices (even without access to the admin panel)
• 🛡️ How to protect your network from reconnection

A word of warning: some methods require router administrator rights or root access on your phone. If you're renting and don't own the router, it's best to coordinate these steps with the network owner.

1. How to find out who is connected to your Wi-Fi on a Samsung A51 phone

Before disconnecting someone from the network, you need to identify the "extra" devices. Galaxy A51 This can be done without additional applications, but with limitations.

Standard method:

1. Open Settings → Connections → Wi-Fi.
2. Tap on the name of your network (connected).
3. Some firmwares will display a list of devices here, but more often you will only see IP address And MAC address your phone.

For a complete list of connected gadgets you will need:

• 📊 Scanner apps (For example, Fing or NetScan)
• 🖥️ Router web interface (if you know the login/password)
• 🔧 Command line (for advanced users)

When using applications like Fing you will receive:

• 📱 Device name (if not hidden)
• 🔢 MAC address
• 🌐 Network card manufacturer (by MAC)
• ⚡ Connection speed

2. Disabling devices via the router's web interface (the most reliable method)

If you have access to your router settings, this is the most effective method. The instructions are universal for most models (TP-Link, Asus, Keenetic, Zyxel etc.), but the menu paths may differ slightly.

Steps to block:

1. Find out Router IP addressOn . Samsung A51 go to Settings → Wi-Fi → [your network] → Manage router (or enter in your browser 192.168.0.1/192.168.1.1).
2. Enter your login and password (usually admin/admin or indicated on the router sticker).
3. Find the section Wireless network → Customer statistics or DHCP clients.
4. In the list, find the device you want to disconnect and click Block or Disconnect.
5. For permanent blocking add MAC address devices in the blacklist (MAC Filtering).

Example of a router interface TP-Link:

Find out the IP address of the router|

Check login/password to log in|

Find MAC address of target device|

Connect to the router from your phone or PC|

Save settings after blocking-->

⚠️ Attention: If you are renting a place and the router belongs to the provider (for example, Rostelecom or Beeline), changing settings may violate the terms of the contract. In some cases, providers block access to advanced settings.

3. Using Wi-Fi Management Apps on Samsung A51

If you can't access your router, you can try specialized apps. They don't guarantee 100% success, but they often help block unwanted users.

Top 3 apps for Android 10/11 (supported) Galaxy A51):

• 🛡️ WiFi Kill (requires root access) - pauses traffic on selected devices.
• 🔍 NetCut — works via ARP spoofing, can disable devices without root (but less stable).
• 📊 Fing - scans the network and allows you to send Deauth- connection break packages (requires purchase of Pro version).

Instructions for NetCut (without root):

1. Download the app from Google Play.
2. Run a network scan.
3. Select a device from the list.
4. Click Cut Off (disable).

Restrictions:

• ❌ Without root access, the device may reconnect in a few minutes.
• ❌ Some routers block ARP attacks.
• ❌ On Android 12+ It is more difficult for applications to manage network traffic.

How do device disabler apps work?

These applications exploit vulnerabilities in the Address Resolution Protocol (ARP). They send spoofed packets into the network, tricking the router and target device into disconnecting. This isn't hacking, but rather network interference. However, modern routers are learning to block such attacks, so this method isn't always effective.

4. Resetting the router as a last resort

If you can't lock your device through the admin panel (for example, because someone changed the password), there's a radical way left - resetting the router to factory settingsThis will disable all users, including you, so this method should only be used in extreme cases.

How to reset a router from a phone Samsung A51:

1. Find the button on your router Reset (usually hidden in a small hole).
2. Take a paper clip or a toothpick, press and hold the button for 10-15 seconds.
3. Wait until the router reboots (all indicators will light up).
4. Connect to the network with the factory name (indicated on the router sticker).
5. Set a new password in the web interface (192.168.0.1 or 192.168.1.1).

⚠️ Attention: After resetting all router settings (including PPPoE(connection to your ISP) are lost. If you don't know your connection details (username/password from your ISP), your internet connection may be lost. Check them in advance in your personal account or by calling support.

On routers with firmware from the provider (for example, MTS or Megaphone) A reset may not restore the factory password. In this case, you'll need to call support for activation.

5. How to protect Wi-Fi from reconnection

Disconnecting a device is only half the battle. To prevent reconnection, you need to strengthen your network security. Here's what you can do right from your phone. Samsung A51:

Methods of protection:

• 🔒 Change your Wi-Fi password complex (minimum 12 characters, with numbers and special characters).
• 🔄 Disable WPS - This feature simplifies the connection, but makes the network vulnerable.
• 📡 Hide the SSID (network name) so that it does not appear on the public list.
• 🛡️ Enable MAC address filtering (allow connection only to trusted devices).
• 🔄 Update your router firmware - Old versions often contain vulnerabilities.

How to change your Wi-Fi password via your phone:

1. Connect to the router via a browser (192.168.0.1).
2. Go to Wireless → Security (or Wireless Network → Security).
3. Select encryption type WPA2-PSK (or WPA3, if supported).
4. Enter the new password in the field Password/Network key.
5. Save the settings and reconnect all devices.

6. Alternative methods: speed limiting and access time

If you don't want to completely turn off your device, you can limit its capabilities. For example, reduce internet speed or allow connections only during certain hours.

How to set up restrictions on popular router brands:

Example of setting up a schedule on TP-Link:

1. Go to Access Control → Schedule.
2. Create a new rule by specifying the days of the week and hours (for example, from 11:00 PM to 7:00 AM).
3. IN Host List Add the MAC address of the target device.
4. Apply the rule by selecting Deny (deny access).

These methods are useful if you want to:

• 🕒 Limit children's access by time.
• 📉 Reduce speed for bandwidth-hungry devices (e.g. torrent clients).
• 🚫 Block connection in your absence.

7. Legal and ethical aspects of device disconnection

Before blocking someone else's device, there are a few things to consider:

What the law says:

• 📜 If the network belongs to you (you pay for the internet), you have the right to manage connected devices.
• ⚖️ Disabling other people's gadgets without consent can be considered disruption of someone else's equipment (Article 272 of the Criminal Code of the Russian Federation - unauthorized access to computer information).
• 🏠 In rented accommodation, it is better to coordinate actions with the owner of the router.

Ethical standards:

• 🤝 If the device belongs to a neighbor who accidentally connected, simply change the password and warn them.
• 🚨 If you suspect a hack (for example, a device with a Chinese MAC address appears on the network), you should not only disable it but also scan the router for viruses.
• 📡 In public networks (cafes, hotels), disabling other people's devices can lead to conflicts.

⚠️ Attention: Using apps like NetCut or WiFi Kill On other people's networks (for example, at an office or university) this could be considered a cyberattack. Consequences range from blocking your device to legal action.

FAQ: Frequently asked questions about disconnecting devices from Wi-Fi

Is it possible to disconnect a device from Wi-Fi without access to the router?

Yes, but with limitations. Apps like NetCut or WiFi Kill may break the connection, but:

• Without root rights, the effect is temporary (the device will connect again).
• Some routers block such attacks.
• On Android 12+ It is more difficult for applications to manage traffic.

A more secure way is to change your Wi-Fi password using your phone if you have access to your router's settings.

How do I find out the MAC address of another device on my network?

From the phone Samsung A51 do the following:

1. Install the application Fing or NetScan.
2. Run a network scan.
3. In the list of devices, find the one you need and look at the column MAC Address.

The MAC address looks like this 00:1A:2B:3C:4D:5E (6 pairs of characters). The first 3 pairs indicate the manufacturer (e.g. Apple, Samsung, Xiaomi).

What should I do if the device reconnects after disconnecting?

This means that:

• The device is saved in the router's memory (you need to remove it from the list) DHCP Reservation).
• The Wi-Fi password is not changed (the device automatically connects with the saved data).
• The network is on WPS (simplified connection using PIN code).

Solution:

1. Change your Wi-Fi password.
2. Disable WPS in your router settings.
3. Add the device's MAC address to the blacklist (MAC Filtering).

Is it possible to disconnect my device from Wi-Fi if I have an unrooted Android?

Yes, but the possibilities are limited:

• 📱 Through router web interface (if you know the login/password).
• 🔄 Through applications like Fing (sending Deauth-packets, does not work on all routers).
• 🔒 Through changing the Wi-Fi password (will disable everyone except those you give a new password to).

Root rights provide more capabilities (for example, complete blocking of traffic through WiFi Kill), but on Samsung A51 Receiving them may void the warranty.

How do I block a device on a provider's router (MTS, Beeline, Rostelecom)?

Routers from ISPs often have limited settings. Try this:

1. Enter in your browser 192.168.0.1 or 192.168.1.1 (login/password is usually on a sticker).
2. Find the section Device management or Connected clients.
3. If there is no blocking option, call your provider's support team and ask them to disable the device by MAC address.

Some providers (eg. Rostelecom) there is a mobile app for managing the router - it may have a blocking function.