How to Check Who's Using My Wi-Fi on Android: Online Methods and Apps

• Shows all devices connected via your router (you need to enter its IP and login/password).
• Can identify the device manufacturer by MAC address.

⚠️ Attention: Online services that request your router login and password can be dangerous! Use only trusted websites with HTTPS protocol. Never enter data on suspicious resources.

How to check the security of an online service?

Before using the service, please check:

1. The presence of HTTPS in the address bar (🔒 icon).

2. User reviews on forums (for example, 4PDA or Reddit).

3. The domain creation date (you can check it on whois.com – older domains are more reliable).

4. Privacy Policy (should be accessible via link).

Method 4: Manual verification via Android terminal (for advanced users)

If you like to tinker with settings, you can check connected devices via Android terminalYou will need an app for this. Termux (free in Google Play) or any other with command support ping And arp.

Instructions:

1. Install Termux and open it.
2. Enter the command to scan the local network:

   for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip | grep "bytes from" | cut -d" " -f4 | cut -d":" -f1 & done

   (Replace 192.168.1. to your subnet, if it is different.)
3. After scanning, enter:

   arp -a

   This command will show all devices that responded to the ping, along with their MAC addresses.

4. Compare MAC addresses with your devices (you can find them in Settings → About phone → General information → Wi-Fi MAC address).

Example of command output arp -a:

? (192.168.1.5) at 00:1A:2B:3C:4D:5E [ether] on wlan0
? (192.168.1.7) at 00:0A:95:9D:68:15 [ether] on wlan0

Here 192.168.1.5 And 192.168.1.7 — IP addresses of devices, and 00:1A:2B:3C:4D:5E — their MAC addresses. The first 3 pairs of MAC characters usually indicate the manufacturer (e.g., 00:1A:2B - This Intel, 00:0A:95 — Apple).

How to distinguish your device from someone else's: 5 signs of "guests"

Even if there are dozens of items on the list of connected devices, not all of them are necessarily foreign. Here's how to separate "friends" from "foes":

• 📱 Device name:
  • Your gadgets usually have meaningful names: Galaxy-S21-Ultra, iPad-Pro, Mi-TV-Stick.
  • Aliens are often named randomly: Android_abc123, Client-5678, or in general Unknown.
• 🔧 MAC address:
  • The first 3 bytes of the MAC (eg. 00:1A:2B) indicate the manufacturer. Check them in the database. macvendors.com.
  • If the address starts with 00:0C:29 or 00:50:C2 - these are virtual machines (maybe someone is using your Wi-Fi for VPN).
• 📊 Traffic consumption:
  • In the router or applications like Fing See how much data the device is transmitting.
  • If an unknown gadget transfers gigabytes per hour, it is 100% a “guest”.
• ⏱️ Connection time:
  • Your devices connect at their usual time (morning, evening).
  • Strangers may appear at night or when you are not at home.
• 🔗 Connection type:
  • If the device is connected via Wi-Fi, but its signal is weak (for example, -80 dBm), it is located far from the router (possibly at the neighbors).
  • Devices with connection via Ethernet (wire) are unlikely to be strangers unless you have a guest cable.

1. Check the MAC address using the macvendors.com database

2. Compare your activity time with your schedule

3. View the amount of traffic consumed

4. Try disconnecting the device via the router and see if the speed improves.

5. Ping the IP address (if it responds, the device is active) -->

What to do if you find someone else's device on your network

Spotted a "guest"? Don't panic—here's a step-by-step plan:

1. Disable the device temporarily:
   • Find the section in your router settings DHCP Reservation or Connected Devices and block the MAC address of the stranger.
   • Some routers have a button Kick or Disconnect next to each device.
2. Change your Wi-Fi password:
   • Use a complex combination of 12+ characters with numbers, letters and symbols (eg. kL9#pQ2!mN4@xY7).
   • Do not use personal information (dates of birth, names).
3. Configure a MAC address whitelist:
   • Enable the function in your router MAC Filtering and add only the addresses of your devices.
   • Cons: If you buy a new gadget, you will have to update the list.
4. Update your router firmware:
   • Outdated versions of software have vulnerabilities that hackers exploit.
   • The update is usually available in the section Administration → Firmware Upgrade.
5. Enable guest network:
   • Create a separate network for guests with limited access to local resources.
   • This will protect your main devices even if the password is hacked.

• Some malware (Mirai, VPNFilter) infect routers and provide access to hackers.
• Use Dr.Web CureIt! or Kaspersky Virus Removal Tool for scanning.

⚠️ Attention: If someone else's device reappears after changing the password and blocking MAC addresses, your router may have been hacked at the firmware level. In this case, only a full factory reset (press the button) will help. Reset on the back panel).

How to Protect Your Wi-Fi from Future Hacking: 7 Tips

The best defense is prevention. Follow these recommendations to minimize your risks:

• 🔐 Use WPA3:
  • This is the most secure encryption standard available today. If your router doesn't support it, update its firmware or buy a new one.
  • WPA2 is vulnerable to attacks KRACK, and WEP can be cracked in minutes.
• 🔄 Change your password regularly:
  • Do this once every 3-6 months, especially if you have guests often.
  • Do not use the same password for Wi-Fi and the router admin panel.
• 📵 Disable WPS:
  • Technology Wi-Fi Protected Setup It's convenient, but it has a critical vulnerability - it can be hacked in a few hours.
  • It can be disabled in the router settings in the section Wireless → WPS.
• 🌐 Hide SSID:
  • Disable network name broadcasting in settings (Hide SSID). This won't protect you from experienced hackers, but it will stop random "neighbors".
  • Cons: You will have to enter the network name manually on new devices.
• 📡 Limit signal strength:
  • If the router is located near a window, reduce the transmission power so that the signal does not “leave” beyond the apartment.
  • The setting is usually located in Wireless → Transmit Power.
• 🔍 Enable connection logging:
  • Enable logging in your router (System Log or Event Log).
  • This will help you track when and which devices connected to the network.
• 🛡️ Use VPN on your router:
  • Set up OpenVPN or WireGuard directly on the router (if it supports it).
  • This will encrypt all traffic, even if a hacker connects to the network.

Extra tip: If you have a smart home (Google Home, Yandex Station, Xiaomi Mi Home), create a separate network for these devices (VLAN (or guest Wi-Fi). This way, even if your speaker is hacked, the hacker won't have access to your laptop or smartphone.

FAQ: Frequently asked questions about checking Wi-Fi on Android