How to Find Out if Someone's Using My Wi-Fi: A Step-by-Step Guide with Checking and Blocking

Have you noticed your internet has slowed down and your data is running out early? Someone may have connected to your Wi-Fi network without your knowledge. Unauthorized devices not only hog your speed but can also pose security threats, from spying on your data to infecting your entire local network with viruses.

In this article you will find 7 proven methodsHow to find out who's using your Wi-Fi, even if you're not an IT professional. We'll look at how to check connected devices using router web interface, mobile apps, and third-party programs, and we'll also learn how to block strangers permanently. All instructions are suitable for popular router brands: TP-Link, ASUS, Keenetic, Zyxel, MikroTik and others.

Don't have time to read everything? Take advantage of quick check at the end of the article or go straight to the section on blocking unwanted devices.

Signs that someone else is using your Wi-Fi

Before checking your router, pay attention to indirect signals. They will help you determine whether there's any cause for concern:

  • 📉 Internet speed has dropped sharply Without any objective reason (the provider isn't doing any maintenance, the tariff hasn't changed). This is especially noticeable in the evening, when neighbors are actively using the internet.
  • 🔄 The Wi-Fi light on the router is blinking too fast., even when you're not using the internet. This could mean other devices are actively transmitting data.
  • 💸 Traffic is running out faster than usualFor example, with a 100 GB per month plan, you used 80 GB in a week, even though you didn't download anything.
  • 🔌 Unknown devices appear on the network (for example, in the list of connected gadgets on the phone or in Google Home).

One of these signs isn't a reason to panic—the problem could be with your router or ISP settings. But if it matches 2-3 points, it's time to check the network for "hares".

⚠️ Attention: Some viruses and botnets (eg. Mirai) can connect to vulnerable routers and use them for DDoS attacks. If you notice suspicious activity, immediately block unknown devices and change your Wi-Fi password.
📊 How often do you check the devices connected to your Wi-Fi?
Never
Once every six months
Only if I notice problems
Regularly, once a month

Method 1: Checking via the router's web interface (the most reliable method)

Any router keeps a log of connected devices. To view it, go to admin panel Via a browser. The instructions are universal for most models, but the menu paths may vary slightly.

Find first Your router's IP address. It is usually indicated on a sticker on the back panel (for example, 192.168.0.1 or 192.168.1.1). If there is no sticker, look at the address in the network settings:

  • 🪟 On Windows: open Command line (Win + R → cmd) and enter 
    ipconfig
    The address you are looking for will be in the line Main gateway.
  • 🍎 On MacOS: open Terminal and enter 
    netstat -nr | grep default
    .
  • 📱 On Android/iOS: Go to Wi-Fi settings, click on your network and look at the section Router or Gateway.

Now follow these steps:

  1. Open your browser and enter the router's IP address into the address bar (e.g. http://192.168.0.1).
  2. Enter your login and password (by default it is often admin/admin or admin/passwordIf it doesn't fit, look at the router sticker).
  3. Find the section with connected devices. Depending on your router model, it may be called:
    • DHCP → DHCP Clients List (TP-Link)
    • Local Network → Client List (Keenetic)
    • Wireless → Wireless Client List (ASUS)
    • Network → Active Clients (Zyxel)
  • A table with devices will appear. Note the columns:
    • Host Name (device name, eg iPhone-12-Pro)
    • MAC Address (unique identifier, looks like 00:1A:2B:3C:4D:5E)
    • IP Address (local IP, for example, 192.168.0.103)

      • Compare the list with your devices. Unknown MAC addresses or strange names (for example, android-123456 (without being tied to your gadgets) is a sign of an outside connection.

      Check the MAC address using a search engine (it may belong to a smart bulb or other gadget)

      Disconnect the device from the network (if possible via the web interface)

      Change your Wi-Fi password to a more complex one.

      Enable MAC address filtering (instructions below)

      -->

      Method 2: Mobile apps for network analysis

      If you're too lazy to access your router settings or don't have access to a computer, use specialized apps. They scan your network and display all connected devices with detailed information.

      Best free apps for Android And iOS:

      Application Platform Peculiarities Link
      Fing Android, iOS Scans the network in 10 seconds, shows the device manufacturer by MAC, tests the speed App Store / Google Play
      WiFi Analyzer Android Shows signal strength, channels, connected devices and their activity Google Play
      NetScan iOS Detailed report of all devices on the network, including hidden ones App Store
      Who Is On My WiFi Android Sends notifications about new devices, maintains connection history Google Play

      How to use (using example) Fing):

      1. Download and install the application.
      2. Connect to your Wi-Fi network.
      3. Click Scan - after a few seconds a list of devices will appear.
      4. Click on the unknown device to view it MAC address, manufacturer And IP.

      The advantage of apps is that they show even those devices that the router does not display in the web interface (for example, if they are connected directly via cable or use a static IP).

      ⚠️ Attention: Some applications require root rights on Android for deep scanning. Without them, functionality may be limited. iOS Due to system limitations, scanning only works within a local network.

      Method 3: MAC Address Filtering (How to Block Intruders Permanently)

      If you find any unwanted devices, you can block them using MAC address filteringThis method is more secure than simply changing the password, since even if an attacker learns the new password, their device will not be able to connect.

      Instructions for popular routers:

      • 🔧 TP-Link:
        1. Go to the web interface (192.168.0.1 or 192.168.1.1).
        2. Go to Wireless → Wireless MAC Filtering.
        3. Select Enable (enable filtering).
        4. In the field Filtering Rule please indicate Deny (deny connection for specified MAC).
        5. Add MAC addresses of third-party devices and save the settings.
      • 🔧 ASUS:
        1. Go to Wireless Network → MAC Filter.
        2. Select mode Refuse.
        3. Enter MAC addresses manually or select from the list of connected devices.
        4. Save the changes.
    • 🔧 Keenetic:
      1. Go to Home Network → Devices.
      2. Find the unknown device and click on it.
      3. Select Block.

      • After setting up filtering reboot the routerfor the changes to take effect. Now blocked devices won't be able to connect, even if they know the password.

      Method 4: Change your Wi-Fi password (easy, but not always enough)

      The fastest way to get rid of strangers is change your Wi-Fi passwordThis will help if strangers connect due to weak encryption (for example, WEP) or password leaks.

      How to change your password (universal instructions):

      1. Go to the router's web interface (see Method 1).
      2. Find the section Wireless (or Wi-Fi, Wireless network).
      3. In the field Password (Password, Key) enter a new password.
      4. In the field Security Mode (Security mode) select WPA2-PSK or WPA3-PSK (never use WEP!).
      5. Save your settings and reconnect your devices.

      Recommendations for choosing a password:

      • 🔐 Length not less than 12 characters.
      • 🅰️ Use mixed case letters, numbers, and symbols (!@#$%).
      • 🚫 Do not use personal information (date of birth, pet's name, address).
      • 🔄 Change your password once a 3-6 months.
      ⚠️ Attention: If unauthorized devices reappear on the network after changing the password, it means someone has physical access to the router (for example, neighbors through a power outlet) or is exploiting a firmware vulnerability. In this case update your router firmware and turn it on guest network to restrict access.

      Method 5: Guest Wi-Fi – How to Share the Internet Without Risk

      If you frequently provide Wi-Fi access to guests or tenants but don't want to risk your main network, set up guest Wi-FiThis function creates a separate network with limited rights:

      • 🔒 Guests won't see your devices on the local network.
      • 📶 You can limit the speed and operating time.
      • 🔄 Easily disable access at any time.

      How to set up a guest network (using an example) TP-Link):

      1. Log into your router's web interface.
      2. Go to Wireless → Guest Network.
      3. Turn on the guest network (Enable Guest Network).
      4. Set the network name (SSID) and password.
      5. In the section Access Intranet select Disable (deny access to local network).
      6. Limit your speed in Bandwidth Control, if necessary.
      7. Save the settings.

      Now you can share your guest network password without worrying about the security of your main network. This is especially important for Airbnb, offices or cafes where many people use Wi-Fi.

      What should I do if my router doesn't have a guest network feature?

      If your router does not support a guest network (for example, older models), you can create a separate network manually:

      1. Buy an inexpensive second router and connect it to the main one via cable.

      2. Set up a separate Wi-Fi network on it with a different name and password.

      3. Disable access to the main router's local network through the settings Firewall or ACL.

      Method 6: Update your router firmware (patching vulnerabilities)

      If unauthorized devices still appear on your network even after changing your password and blocking your MAC address, your router may be vulnerable to hacker attacks. Manufacturers regularly release firmware updates that patch security holes.

      How to update firmware:

      1. Log into your router's web interface.
      2. Find the section System Tools → Firmware Upgrade (or Administration → Software update).
      3. Click Check for Updates (check for updates).
      4. If a new version is available, download and install it.
      5. Do not turn off the router during the update! This may cause damage.

      After update:

      • 🔄 Reboot your router.
      • 🔐 Reset to factory settings (Reset button on the back panel).
      • 🛠️ Reconfigure the network with a new password.
      ⚠️ Attention: On some routers (for example, MikroTik) Updating the firmware may reset the settings. Save the configuration to a file in advance (System → Backup).

      Method 7: Advanced Tools (for experienced users)

      If standard methods fail, use professional network analysis tools. They show not only connected devices but also their activity, traffic consumption, and even possible attacks.

      Popular tools:

      • 🖥️ Wireshark — analyzes network traffic in real time. Complex for beginners, but provides maximum information.
      • 🖥️ Nmap — scans the network and detects all devices, including hidden ones. Scanning commands: 
        nmap -sn 192.168.0.0/24

        (replace 192.168.0.0/24 to your router's subnet).

      • 🖥️ Angry IP Scanner — a simple utility for scanning IP addresses on the network. Shows MAC address, manufacturer, and open ports.

      Example of use Wireshark:

      1. Download and install the program from the official website.
      2. Select network interface (Wi-Fi adapter).
      3. Start packet capture (Start).
      4. Enter in the filter wlan.addr == 00:1A:2B:3C:4D:5E (replace with the suspicious MAC address).
      5. Analyze your traffic: If your device is sending a lot of packets to external IP addresses, it could be a botnet or a hacking tool.

      These tools require technical knowledge but provide 100% control over the network. If you're unsure of your abilities, it's best to consult a specialist.

      ⚡ Quick Check: 3 Steps to Find Out Who's Using Your Wi-Fi

      No time for detailed setup? Follow these steps:

      1. Look at the indicator on the router:
        • If the light bulb Wi-Fi blinks frequently even at night - someone is actively using the network.
        • If it is constantly lit, there are no connections or they are inactive.
      2. Run scan via Fing (mobile app):
        • Download Fing from App Store or Google Play.
        • Click Scan — in 10 seconds you will see all devices.
    • Change your password:
      • Go to your router settings (192.168.0.1).
      • In the section Wi-Fi Change your password to a complex one (12+ characters).

      If after this the foreign devices disappear, the problem is solved. If not, use MAC filtering or update the firmware.

      ❓ Frequently Asked Questions

      Is it possible to find out who exactly connected to my Wi-Fi (name, address)?

      No, you can't identify a user by their MAC address or IP address. The most you can find out is the device model (e.g., iPhone 13 or Samsung Galaxy S22) and the Wi-Fi chip manufacturer (e.g. Broadcom or Qualcomm).

      If the connection is illegal (for example, your neighbors are stealing your Wi-Fi), you can:

      • File a complaint with your provider (they can trace the MAC address back to the subscriber).
      • Contact the police if there is evidence of a hack (for example, an attempt to access your data).
      Why do unknown gadgets with names like "android-123456" appear in the list of devices?

      These could be:

      • 📱 Smart devices (lamps, sockets, cameras) that you forgot to set up.
      • 🤖 Botnets — viruses that connect to vulnerable routers for attacks.
      • 📡 Neighbourswho accidentally connected to your network (if the password is weak).

      To check, disconnect all your devices from Wi-Fi and see if the unknown device remains in the list. If so, block him.

      How to protect your Wi-Fi from future hacking?

      Follow these rules:

      • 🔐 Use WPA3 (or WPA2, if WPA3 is not supported).
      • 🔄 Change your password once a 3-6 months.
      • 🚫 Turn it off WPS (This is a vulnerable protocol for fast connection).
      • 🛡️ Turn on firewall (Firewall) in the router settings.
      • 📡 Hide the network name (SSID), if it does not interfere with your devices.
      Is it possible to track connected devices without access to the router?

      Yes, using mobile apps (Fing, NetScan) or computer utilities (Angry IP Scanner, Nmap). They scan the local network and show all active devices.

      However, to block strangers, you will still need access to the router settings.

      What to do if your router is hacked and its settings are reset?

      First, disconnect your router from the internet (remove the ISP cable). Then:

      1. Reset settings with the button Reset (hold for 10-15 seconds).
      2. Connect to the router via cable and go to the web interface.
      3. Update your firmware to the latest version.
      4. Reconfigure the network with a new name and password.
      5. Turn on MAC filtering.

      If the router continues to behave strangely (for example, it changes its settings by itself), replace it - it may be infected with a virus at the hardware level (as is the case with VPNFilter).

    • 📖 Read also

    WiFi MAC Randomization: What is it and why should I enable it? A detailed analysis of MAC Randomization technology in WiFi networks. Learn how address randomization works. How to set a password on a Wi-Fi router: step-by-step instructions A detailed guide on how to set your own Wi-Fi password. Protecting TP-Link, D-Link, and Asus routers. How Wi-Fi data is intercepted: network security methods An analysis of wireless traffic interception methods. How hackers steal passwords and personal data through How to hack Wi-Fi with a password: myths and the reality of protection Find out if it's possible to hack a Wi-Fi password, what WPA2 vulnerabilities exist, and how to protect yours. How to Find the Wi-Fi Password on a Laptop: Windows and Mac Detailed instructions on how to view a forgotten Wi-Fi password on a laptop. Working methods for Windows How to Password Protect Wi-Fi on Your Phone: Setup Instructions A detailed guide on how to set a password on your router using your smartphone. TP-Lin Security Setup