Do you suspect someone of using your wireless network without your permission? If you want to know which devices are connected to your WiFi, you've come to the right place. There are a number of ways to do this! This wikiHow teaches you how to check who is connected to your Wi-Fi network.
Steps
Method 1 of 3: Using a wireless modem

Step 1. Open a browser
You can use a web browser to log into your wireless modem's web interface. You can use the web interface to set up and configure your wireless network and check who is connected to your wireless modem.

Step 2. Type the IP address of your modem in the address bar
This will take you to the web interface of your wireless modem. Its IP address will vary by make and model. To find the specific IP address of your wireless modem, refer to the user manual or the manufacturer's web page.
- Common IP addresses of modems are 192.168.1.1 and 10.0.0.1.
- You can find the IP address of your modem using the command prompt in Windows. Open the Start menu and type cmd to display the command prompt. Click on it to open it. Then type ipconfig /all and press {{keypress}Enter}. Find the IP address to the right of 'Default Gateway'.

Step 3. Enter your username and password
If you have not changed the username and password, please enter the default information. This may vary depending on the make and model of your modem. To find your modem's default username and password, refer to the user manual or the manufacturer's web page.
Common usernames and passwords are 'admin' and 'password'

Step #4. Look for a list of devices
You can find a list of connected devices in your modem's web interface. This depends on the make and model of your modem. It can be found under "Connected devices" or "Connected devices" or something similar. This shows the name and MAC address for each connected device.
If you notice any devices that don't belong, make sure to change your Wi-Fi password. Make sure to use WPA2-PSK encryption if it's available. This will force all connected devices to re-enter the new password in order to reconnect
Method 2 of 3: Using the Command Prompt

Step #1. Open Command Prompt
This can be found in any Windows version by pressing your Windows key and typing 'cmd'.
On the Mac, you can do this in the terminal. Click on the magnifying glass icon in the top right corner and type terminal in the search bar, then click on terminal

Step 2. Type 'arp -a' in the window

Step 3. Look at the IP addresses
The IP addresses that start with the same numbers as your modem's IP address (eg 192.168) are connected to your modem. This displays the IP address and MAC address of each connected device.
Every device that connects to the Internet has a unique MAC address. In general, you can find the MAC address of a device in the 'Settings' menu under 'Network or Internet settings', or in the information about the device. You can find the MAC address for Windows, Mac, iPhone, Samsung Galaxy there
Method 3 of 3: Using Wireless Network Watcher (Windows only)

Step 1. Go to http://www.nirsoft.net/utils/wireless_network_watcher.html in a web browser
You can use any web browser.

Step 2. Scroll down and click on Download Wireless Network Watcher with full install
It's the second link under 'Feedback' on the page.

Step 3. Click on the installation file and follow the instructions
By default, downloaded files can be found in the Downloads folder. Click on the file that says 'wnetwatcher_setup.exe'. This will open the Wireless Network Watcher installer. Follow the on-screen instructions to complete the installation. Wireless Network Watcher opens when the installation is complete.

Step 4. Open Wireless Network Watcher
It has an icon that resembles an eyeball over a wireless modem. To find it, click on the Windows Start menu and type Wiress Network Watcher. Click the icon to open it. Wireless Network Watcher will automatically scan your network after launch and display a list of connected devices.
Look at the 'Device Name' column to see the name of each device connected to the network and the modem it is connected to

Step 5. Click on the 'Play' triangle icon
It's in the top left corner of Wireless Network Watcher. This will rescan your network and display a list of connected devices.