Have you ever noticed your internet speed suddenly drops, pages take longer to load, or videos buffer? Often, it's not because your ISP is overloaded or your equipment is old, but because your neighbors are simply using your wireless connection. Unauthorized devices connecting to your network is a common occurrence, especially in apartment buildings where the Wi-Fi signal extends far beyond your apartment.
Having uninvited guests on your local network not only means lost traffic and reduced speed, but also poses a serious threat to your digital security. AttackersAnyone who gains access to your Wi-Fi network can theoretically intercept transmitted data, access shared folders, or even attack connected computers and smartphones. That's why the question of "How to check who's using my Wi-Fi network" is critical for any home router user.
In this article, we'll explore proven methods for detecting connected devices, learn how to distinguish system devices from untrusted ones, and, most importantly, consider effective methods for blocking intruders. You don't need to be a network engineer to handle this task: basic browser skills and careful attention to detail when reviewing the list of devices are sufficient.
Primary diagnostics and indirect signs of hacking
Before delving into complex router settings, it's worth paying attention to indirect signs that may indicate an unauthorized connection. The first and most obvious symptom is unstable speed Internet connections. If you're paying for 100 Mbps and getting barely 10-20 Mbps, even if your own devices aren't downloading large files, that's cause for concern.
Another sign may be unusual behavior of the router's indicator lights. Pay attention to the WLAN or Wi-Fi light: if it flashes frequently and erratically when you and your family aren't using the internet (for example, late at night or when everyone has gone to work), it means active data transfer is occurring. Some modern router models also have a feature that displays the number of connected clients, which can be activated through the manufacturer's mobile app.
⚠️ Attention: Don't panic if you see a flashing indicator. Modern smart devices, such as Smart TV, IP cameras or voice assistants, can update or sync data automatically in the background, creating network traffic without your intervention.For a more accurate initial assessment, you can use specialized network scanning apps installed on your smartphone. Apps like Fing or WiFi Analyzer Allows you to quickly see a list of all devices within range of the network and their IP addresses. This will help you get a preliminary idea of how many gadgets are currently "on the air."
📊 Have you noticed a sharp drop in Wi-Fi speed in the evening?Yes, all the time.Sometimes it happensNo, the speed is stableDidn't pay attentionLogin to the router control panel
The most reliable way to get accurate information about connected clients is to log into your router's web interface. This is where the ARP table and a list of active DHCP clients, which reflects the current state of the network. First, you need to find the gateway IP address, which is usually the address of the router itself.
On a computer running Windows, open a command prompt (press
Win + R, entercmdand press Enter). In the window that opens, enter the commandipconfigand find the line "Default Gateway". Most often, this is the address192.168.0.1or192.168.1.1Entering this address into the address bar of any browser will take you to the authorization page.If you've never changed your default login information, it's likely on a sticker on the bottom of your device. Default logins and passwords often look like this:
admin/adminoradmin/1234However, for security reasons, it is recommended to change this information immediately after the first setup of the equipment to prevent anyone from changing your network configuration.What to do if you have lost your router password?
If you changed your router's password and forgot it, you won't be able to recover it. The only solution is to perform a factory reset (hard reset). To do this, locate the small hole marked "Reset" on the router's case and press it with a paperclip for 10-15 seconds while the router is powered on. The router will reboot with factory settings, and you'll be able to log in using the credentials on the sticker.
After successful authorization, the control panel will open. The interface may differ depending on the manufacturer (TP-Link, ASUS, Keenetic, D-Link), but the operating logic remains the same. You need to find the section related to the wireless network or connection status.
Analyzing the list of connected devices
In your router's menu, look for a tab with a name like "Status," "Network Map," or "Client List." On some models, this section is located within the "Wireless" menu. It displays a table containing key information about each device currently using your Wi-Fi.
Typically the list contains the following columns: device name (Hostname), MAC address, IP address, and connection type (Wireless or LAN). MAC address — This is a unique physical identifier for a network card, assigned by the manufacturer and unchanged when reconnected. It's the easiest way to identify the hardware.
Parameter Description Example of meaning Hostname Device name specified by the user or system iPhone-Andrey, Samsung-TV, Desktop-PC MAC Address Unique identifier of the network interface A4:5E:60:C2:11:9B IP Address A temporary address assigned by a router on a local network. 192.168.1.105 Type Router connection type Wireless (Wi-Fi) or Ethernet (cable) Your task is to review the list. Go through each item and try to identify it. Smartphones, tablets, laptops, TVs, game consoles, smart plugs—think of all the gadgets you have in your home. If you see a device named "Unknown" or a brand name you don't own (for example, Xiaomi when you only use Samsung and Apple), this is cause for concern.
To simplify the process, many modern routers allow you to rename devices directly in the interface. Give each device a descriptive name (e.g., "Mom's Phone," "Son's Laptop") so you can quickly navigate the list. This will take some time, but will significantly simplify monitoring later.
☑️ Checking the list of devices
Completed: 0 / 1Methods for blocking uninvited guests
If you discover someone else's device during the scan, you must disable it immediately. There are several ways to do this, from gentle to drastic. The simplest method is to use the "Block" or "Deny Access" feature, if available in your interface directly in the client list.
A more reliable and versatile way is to use MAC address filteringThis feature allows you to create a "blacklist" of devices that are strictly prohibited from accessing the network, or a "whitelist" that allows only trusted devices to connect. To implement this method, copy the MAC address of the intruder from the client list.
Go to Wireless Settings and find "MAC Filtering." Select "Deny/Block" and add the copied address to the list. After saving the settings and rebooting the router, the selected device will lose the connection and will be unable to reconnect, even with the password.
⚠️ Attention: Be careful when using the "Whitelist." If you enable "Allow only listed" but forget to add the MAC address of your current device (the one you're configuring the router from), you'll lose network access. In this case, the only solution is to reset the settings using the Reset button.A radical, yet most effective, method is to completely change your Wi-Fi password. If you change your wireless network security key, all connected devices will be instantly disconnected. You'll have to re-enter the new password on all your devices, but you're guaranteed to "kick out" all unauthorized users, even if they've used sophisticated methods to bypass the security.
Strengthening wireless network security
It's not enough to simply kick out "freeloaders"—you need to make sure they can't come back. The first step to security is using a strong encryption protocol. Make sure the security type is selected in the Wireless Mode settings. WPA2-PSK or, even better, WPA3WEP and WPA protocols have long been considered obsolete and can be easily cracked with specialized utilities in a matter of minutes.
The passphrase also plays a critical role. It shouldn't contain obvious information like a phone number, date of birth, or address. The optimal password length is at least 12 characters, using mixed-case letters, numbers, and special characters. Avoid using default passwords, such as those often printed on router stickers, if you can change them.
Another useful feature is disabling WPS (Wi-Fi Protected Setup). This protocol was designed to simplify connecting devices without entering a password (for example, using a push-button or PIN), but it contains vulnerabilities that allow attackers to recover the network password. In your router settings, find the WPS option and set it to "Disabled."
Update your router firmware regularly. Manufacturers constantly release updates to patch security holes. You can check for a new firmware version in "System Tools" -> "Firmware Upgrade."
Frequently Asked Questions (FAQ)
Can my neighbor see what websites I visit if he is connected to my Wi-Fi?
If you use modern WPA2/WPA3 encryption, your neighbor won't be able to see the contents of your messages or bank passwords. However, they can see the list of domains (websites) you access using traffic sniffers. Full protection is only ensured by using HTTPS and a VPN.
Why do "Unknown" or strange names appear in the device list?
This often happens with Internet of Things devices (smart lamps, plugs, vacuum cleaners) that don't transmit the correct hostname. Also, some operating systems (such as Android or iOS) may hide the device's real name for privacy reasons. Always check the MAC address.
What should I do if I blocked a device and it appears online again?
This could mean the attacker has the ability to change their network card's MAC address (spoofing), or you've blocked the wrong device. In this case, the only sure solution is to change your Wi-Fi password to a complex and unique one and disable WPS.
Does the number of connected devices affect internet speed?
Yes, directly. The Wi-Fi channel is shared among all active users. If one starts downloading torrents or watching 4K video, the others will only get a small portion of the bandwidth, resulting in lag and slow page load times.
Do I need to change the password for the router (admin panel) and Wi-Fi to different ones?
Yes, these are two different levels of security. The Wi-Fi password is used to connect to the network, and the router admin password is used to manage settings. It's recommended to make them different and complex so that if one is compromised, the other remains intact.