How can I see who is connected to my WiFi on my computer?

A sudden drop in internet speed is often the first warning sign for a router owner. You're paying for a 100 Mbps plan, but HD videos barely load, and pages load slowly? In such a situation, the first thing you suspect is that your wireless network is compromised. an uninvited guest joined in.

A neighbor who parks their car near your window or a hacker who guesses a simple password can use your bandwidth to download torrents or watch movies. This not only steals your speed but also creates potential security threat personal data stored on computers in the local network.

Fortunately, modern routers and operating systems provide ample tools for identifying intruders. You don't need to be a system administrator to perform basic network diagnostics and discover a list of devices that are currently using your Wi-Fi.

In this article, we'll explore proven methods for monitoring traffic and connected clients. We'll cover standard Windows tools, the router's web interface, and specialized software, so you can choose the most convenient option.

Analyzing connections via the router's web interface

The most reliable and accurate way to find out who's using your Wi-Fi is to look into the "brains" of your router. It's the router that manages IP address distribution and knows MAC addresses all connected gadgets. To access the settings, you'll need a browser and the default gateway address.

The login address is usually found on a sticker on the bottom of the device. Most often, it's a combination 192.168.0.1 or 192.168.1.1Enter these numbers in the browser's address bar and enter your username and password (often admin/admin, if you haven't changed them). After logging in, look for a section with a name like Wireless, Wi-Fi or Client List.

Within this section, you'll see a table with active clients. This displays MAC addresses, IP addresses, and sometimes device names (e.g., iPhone-Alex or PC-Work). If you see a device that you can't identify, it's most likely the intruder.

⚠️ Attention: Router interfaces from different manufacturers (TP-Link, ASUS, D-Link) vary significantly. Tab names can range from "Client List" to "DHCP Server Lease." If you can't find the item you need, consult the manual for your specific model.

Identifying someone else's device can be difficult, as the list can include not only phones but also smart plugs, TVs, or game consoles. To avoid accidentally blocking your smart refrigerator, make a list of your gadgets beforehand.

Checking via the Windows command line (CMD)

If you can't access your router settings or want to run a quick check without logging into the web interface, use Windows' built-in tools. The command line allows you to see which devices are in your local network and exchange data with your PC.

To begin, launch the command prompt. Click Win + R, enter cmd and press Enter. The first thing you need to do is update the ARP table, which stores the mappings between IP and MAC addresses. Enter the command arp -a and press Enter.

You'll see a long list of addresses. Don't be alarmed, most of them are system processes or broadcast addresses. You need to pay attention to the addresses that start with your subnet prefix (usually 192.168.0.x or 192.168.1.x), which are not your own IP.

This method only shows devices your computer has already "communicated" with. To expand the list, you can first ping the entire network. Enter the command:

for /L %i in (1,1,254) do ping -n 1 -w 100 192.168.1.%i

After the ping cycle is complete (this will take a couple of minutes), enter again arp -aThe list should be updated with new addresses. Now you can compare the received MAC addresses with the labels on your devices or use online services to identify the manufacturer by the first six characters of the MAC address.

Using specialized network scanners

For those who prefer a graphical interface and more detailed information, there are specialized scanner programs. They automatically create a network map, identify the operating systems of connected devices, and even open ports.

One of the most popular utilities is Advanced IP ScannerIt's free, requires no installation (portable version), and runs very fast. After launching, simply click the "Scan" button, and the program will display all active nodes.

• 🔍 Wireless Network Watcher — a utility from NirSoft that displays a list in a convenient table and can signal with a sound when a new device appears.
• 📡 Angry IP Scanner — a cross-platform, open-source scanner that can scan not only local networks, but also remote areas.
• 🛡️ Fing — originally a mobile app, but with a desktop version for Windows that perfectly identifies device types (camera, printer, PC).

Using third-party software offers the advantage of visualization. You'll immediately see, for example, a device with a MAC address starting with A4:C3:F0, belongs to the company Xiaomi, which will help quickly identify "smart" equipment.

Mobile apps for WiFi auditing

Often, your computer is busy with important work, and there's no time to bother with installing scanners. In this case, a smartphone already connected to your Wi-Fi network comes to the rescue. There are numerous apps for Android and iOS that allow you to do this. security audit in a couple of clicks.

Apps like Fing or WiFi Analyzer They scan the airwaves and show not only connected clients but also signal strength, neighboring network channels, and bandwidth utilization. This is useful if you want to not only find a freeloader but also optimize your router's performance.

The main advantage of mobile scanners is the ability to quickly check the network from anywhere in the apartment. You can walk through the rooms and see if the list of devices has changed depending on your location, although this isn't critical for a global list.

It's worth remembering that on iOS, the functionality of such apps may be limited by Apple's security system, which hides some network details from third-party software. On Android, the capabilities are usually more extensive.

How to block an uninvited guest

Finding someone else's MAC address is only half the battle. The main thing is to block their access. The most effective way is to use MAC address filtering (MAC Filtering) in the router settings.

Find the "Wireless MAC Filtering" section in the router interface. Enable "Deny" or "Blacklist" mode and enter the intruder's MAC address. After applying the settings, this device will be physically unable to connect, even with the password.

⚠️ Attention: A MAC address can be spoofed (cloned). If an advanced user joins your network, they can change their network card's MAC address to match the address of your authorized device, causing an IP conflict.

A more radical and reliable method is to change your Wi-Fi password. Changing the security key will disable all devices. You'll have to reconnect your devices, but access to them will be guaranteed to be blocked for all unauthorized users.

Also, don't forget to check if the feature is enabled WPSThis technology allows for connection using a PIN code or a push-button, but it is often vulnerable. It's best to disable WPS completely in your wireless network settings.

Prevention: How to protect your network from hacking

The best defense is prevention. To avoid the "who's connected to my Wi-Fi" question from arising too often, it's essential to configure your router correctly immediately after purchase. Weak passwords are the main cause of intrusion.

Use a complex password that includes mixed-case letters, numbers, and special characters. The password must be at least 12 characters long. The encryption type must be WPA2-PSK or WPA3Old WEP and WPA protocols can be easily broken with special programs in a matter of minutes.

Update your router firmware regularly. Manufacturers release updates that patch security holes. Check the firmware version in the "System Tools" or "Administration" section and compare it with the version on the official website.

If you rent out your apartment or often have guests, create a separate room for them. guest network (Guest Network). It is isolated from your main network, where computers with important data and network-attached storage (NAS) devices are located.

Can a neighbor steal my password if I haven't given it to anyone?

Yes, it's possible. There are programs for brute-forcing passwords or exploiting WPS vulnerabilities. Alternatively, the password could have been saved on the device of a friend who came to visit, and now their phone automatically shares the network or connects automatically when they're near your house.

Does connecting one other phone affect the speed?

It depends on what the phone is doing. If someone is just messaging, you won't notice. But if they're downloading games or watching 4K videos, it can eat up to 80% of your bandwidth, especially on plans with speeds of 50-100 Mbps.

What is a hidden network (Hidden SSID) and should I enable it?

A hidden network doesn't broadcast its name over the air. To connect, you must manually enter the network name. This provides weak protection from nosy neighbors, but doesn't protect against hackers, who can see traffic even on hidden networks. It's best to use a strong password.

How often should I change my Wi-Fi password?

It's recommended to change your password every 3-6 months, or immediately after you've separated from the person you gave access to (for example, if your tenant moves out). Changing your password is also mandatory if you suspect something is amiss.