How to Block Other Users' Wi-Fi on Your Computer: A Complete Guide

Have you noticed that your internet speed has suddenly dropped, and the indicator light on your router is flashing more frequently than usual? It might be related to your network. Unauthorized users have connected to Wi-Fi. — neighbors, guests, or even hackers. Even if you've set a password, some people manage to crack it or exploit vulnerabilities in your router settings. In this article, we'll look at how effectively block access to Wi-Fi directly from your computer, without resorting to complex technical manipulations.

It is important to understand that blocking at the PC level is additional security measure, and isn't a full-fledged replacement for router security. If an attacker has already connected to your network, they can intercept traffic or attack other devices. Therefore, combine the methods in this article with the router's settings (we'll cover those too).

We will look at ways to Windows 10/11, as well as universal solutions that work regardless of the operating system. No "secret commands" or hacking—only legal and proven methods.

1. Blocking through router settings (the most reliable method)

The first thing to do is go to the router control panel and set up device filtering. This method works on all routers (TP-Link, ASUS, Keenetic, MikroTik etc.), regardless of the computer model.

Instructions:

• 🔌 Connect to the router via cable or Wi-Fi (if you suspect someone is already on the network, use a wired connection).
• 🌐 Open your browser and enter in the address bar 192.168.0.1 or 192.168.1.1 (the exact address is indicated on the router sticker).
• 🔑 Enter your login and password (usually admin/admin, if you haven't changed it).
• 📋 Go to the section Wireless → Wireless MAC Filter (or similar, for example, Wireless Mode → MAC Filter).

Next, select the mode Deny (Ban) and add to blacklist MAC addresses suspicious devices. To find them:

1. Open the section DHCP → DHCP Clients List (or DHCP clients).
2. Compare the list with your devices. Unknown MAC addresses are potential "outsiders."
3. Copy them and add them to the filter.

Where can I find the MAC address of my device?

On Windows: open Command line (Win + R → cmd) and enter ipconfig /all. Look for the line Physical address.

On Android: Settings → About phone → General information → Wi-Fi MAC address.

On iPhone: Settings → General → About → Wi-Fi Address.

⚠️ Attention: MAC addresses can be spoofed, so this method isn't 100% secure. For added security, combine it with changing your Wi-Fi password to a complex one (at least 12 characters, including numbers and special characters).

2. Using the built-in Windows firewall

If you don't want to go into your router settings, you can block access to the Internet for specific devices directly through Windows Defender FirewallThis won't disconnect them from Wi-Fi, but it will prevent them from accessing the network.

Algorithm:

1. Click Win + R, enter wf.msc and press Enter (will open) Windows Firewall with Advanced Security).
2. In the left menu, select Outbound Rules → Create Rule.
3. Specify the rule type Customizable, click Next.
4. On the page Program select All programs.
5. In the section Remote addresses Add IP addresses of suspicious devices (they can be found in the list of DHCP clients on the router).
6. Select an action Block connection and complete the rule creation.

Now devices with blocked IP addresses will be unable to access the internet via your Wi-Fi, but will remain connected to the network. This is convenient if you want to "catch" an intruder or simply limit their activity.

3. Programs for monitoring and blocking Wi-Fi

If manual methods seem complicated, use specialized utilities. They scan the network, display all connected devices, and allow you to block them with one click.

NetCut - one of the most powerful solutions: the program can completely disable internet access for any device on the network, even if it is connected to the routerHowever, its use may violate the rules of some providers (especially in corporate networks).

⚠️ Attention: Programs like NetCut They operate through ARP spoofing, which could potentially disrupt network operation. Do not use them on office or public networks without administrator permission.

4. Changing the router password and security settings

If you suspect that your Wi-Fi password has become known to strangers, change it immediatelyBut don't stop there—check other security settings, too:

Use a password ≥12 characters long with numbers and special characters|Enable WPA3 encryption (or WPA2 if WPA3 is not available)|Disable WPS (vulnerable to brute-force attacks)|Hide SSID (do not show the network name)|Update the router firmware to the latest version-->

How to change your password:

1. Go to the router control panel (see Section 1).
2. Go to Wireless → Wireless Security (or Wireless Mode → Security).
3. In the field Password (Password) Enter a new key. Example of a strong password: k7#pL9!vR2$mQ1.
4. Save your settings and reconnect all your devices.

Additionally:

• 🔄 Update your router firmware in the section Administration → Firmware UpgradeOutdated versions often contain vulnerabilities.
• 🚫 Turn it off WPS (Wi-Fi Protected Setup) - this feature can be hacked in a few hours.
• 👁️ Hide SSID (network name) in settings Wireless → Basic Settings (check the box) Hide SSID). This won't protect you from experienced hackers, but it will reduce the number of accidental connections.

5. Setting up static IP and MAC binding

This method is suitable for advanced users. The idea is to Allow Wi-Fi access only to devices with specific MAC addresses, and the rest will be blocked automatically.

Instructions for the router TP-Link (for other brands the steps are similar):

1. Go to your router control panel.
2. Go to Wireless → Wireless MAC Filtering.
3. Select mode Allow (Allow) and add MAC addresses only your devices.
4. Enable filtering and save settings.

Now only devices from the "whitelist" will be able to connect to your Wi-Fi. The downside of this method is that you'll have to manually add the MAC address of each new device (for example, when you have guests).

6. How to detect "strangers" on the network without programs

If you don't want to install third-party software, you can identify third-party devices manually. Here are two ways:

Method 1: Via a router

• 📊 Go to your router control panel.
• 🔍 Open the section DHCP Clients List or Attached Devices (list of connected devices).
• 📋 Compare MAC addresses with your devices. Unknown addresses are potential "foreigners."

Method 2: Via the Windows command line

netsh wlan show hostednetwork settings=security
arp -a

The first command will show information about your Wi-Fi network (if you are distributing the Internet from a PC), the second will list all IP and MAC addresses on the local network.

If you find a suspicious device, block it using one of the methods described above.

7. Additional measures: VPN and guest network

If blocking devices is inconvenient (for example, you often have guests), set up guest network On the router. This is a separate Wi-Fi network with limited access to local resources (printers, network drives) and the ability to limit speed.

How to enable guest network (using example) ASUS):

1. Go to your router control panel.
2. Go to Guest network (Guest Network).
3. Enable guest access, set a separate password.
4. Limit speed (optional) Bandwidth Limiter), if necessary.

For maximum safety, use VPN on your devices. Even if someone else connects to your Wi-Fi, they won't be able to intercept your traffic (passwords, banking information, etc.). Popular VPN services: ProtonVPN, NordVPN, Surfshark.

8. What to do if nothing helps?

If, despite all your efforts, foreign devices continue to appear on your network, it is possible:

• 🔌 Your router has been hacked (for example, through a firmware vulnerability).
• 📡 Someone is using Wi-Fi repeater (repeater) connected to your network.
• 🏠 Your apartment/house has "smart" devices (cameras, light bulbs) that automatically connect to the network.

In such cases:

1. Reset your router to factory settings (button Reset on the back panel).
2. Update your firmware to the latest version.
3. Check your physical connections for any unknown cables or repeaters.
4. Contact your provider—there may be a problem on their end (for example, a data leak in your personal account).

⚠️ Attention: If, after resetting your router, unauthorized devices reappear on the network, this may indicate that your computer is infected with a virus that is "sharing" access. Scan your PC with an antivirus (Kaspersky, ESET, Malwarebytes).

FAQ: Frequently Asked Questions about Wi-Fi Blocking

Is it possible to lock a device by name (eg "iPhone")?

No, the blocking only works MAC address or IPDevice names (hostnames) are easy to spoof, so they are not used for filtering. However, in some routers (for example, Keenetic) you can assign a permanent IP to the device and block it.

What should I do if I blocked myself by mistake?

If you have added your MAC or IP to the blacklist:

1. Connect to the router via cable (if Wi-Fi is blocked).
2. Go to settings and remove your device from the filter.
3. If there is no access via cable, reset the router using the button Reset (hold for 10-15 seconds).

After the reset, all settings will return to factory defaults, including the Wi-Fi password (usually found on the router sticker).

Can my neighbor connect to my Wi-Fi if I hide the SSID?

Yes. Hiding the network name (Hide SSID) does not protect against advanced users - they can find your network using specialized programs (for example, Wireshark or Kismet). This only reduces the number of accidental connections.

How do I permanently block a device so it can't connect even after resetting the router?

No method provides a 100% guarantee, because:

• MAC addresses can be spoofed (MAC spoofing),
• After resetting the router, all filters are reset,
• An attacker could use another channel (for example, connect to your PC via Bluetooth and then attack the network from within).

The most reliable way is change your Wi-Fi password regularly and monitor router firmware updates.

Is it legal to block other people's devices from your network?

Yes, you have every right to control access to his own Wi-Fi networks. However:

• If the network is owned by a provider (for example, in a hotel or cafe), blocking other users may violate the terms of use.
• In some countries, active interference in other people's devices (for example, through NetCut) can be considered a cyber attack.

At home, you can freely adjust your filtration settings, but do not use methods that could damage other people's equipment.