Users often need to configure their home network, but terms like "subnet mask" or "default gateway" are confusing. Search queries often include the phrase "how to find out the Wi-Fi network mask," which is technically incorrect, as Wi-Fi is simply a data transfer method, and the mask itself refers to the protocol. IP addressingHowever, understanding this parameter is critical to the stable operation of all devices in your home.
When you connect a smartphone or laptop to a wireless network, the router automatically assigns it a unique address and mask. This process usually happens silently thanks to the protocol DHCPHowever, when setting up a smart home, gaming servers, or resolving address conflicts, you will need to manually check these values. The standard subnet mask for home networks is always 255.255.255.0, which corresponds to the prefix /24.
In this article, we'll explore where to find this information on different devices and why you need to tweak network settings. You'll learn to distinguish between local IP addresses and external addresses, and understand how to avoid common mistakes when manually configuring TCP/IP.
What is a subnet mask and why is it needed?
A subnet mask is a 32-bit number that divides an IP address into two parts: the network identifier and the host (device) identifier. Simply put, it tells your computer which addresses are "inside" your local computer and which are "outside," on the global internet. Without the correct mask, your device simply won't know where to send data packets.
In the home segment, class C is most often used, where the mask 255.255.255.0This means that the first three octets of the IP address (e.g., 192.168.1) are constant for the entire network, while the last octet can vary from 1 to 254, assigned to each connected device. If you change the mask incorrectly, communication between devices may be completely lost.
There are several recording formats that you may encounter in router settings. MikroTik or Ubiquiti:
- 🔹 Decimal format: 255.255.255.0 (most common).
- 🔹 Binary format: 11111111.11111111.11111111.00000000 (used by hardware).
- 🔹 Prefix notation: /24 (often found in professional settings).
⚠️ Attention: Never change the subnet mask in your WAN (wide area network) settings unless your ISP has provided you with a static IP address with specific requirements. A mistake here will result in complete internet inaccessibility.
How to find network settings on Windows
operating system Windows provides several ways to view current network settings. The fastest and most reliable method is using the command line. This is a universal method that works on all OS versions, from Windows 7 until fresh Windows 11.
To get information, press the key combination Win + R, enter cmd and press Enter. In the black window that opens, enter the command ipconfigThe system will display a list of all network adapters. Find the "Wireless LAN Adapter" (or "Wireless LAN adapter Wi-Fi") section. The IPv4 address, subnet mask, and default gateway will be listed there.
If you need a graphical interface, go to the menu Settings → Network and Internet → Wi-FiClick on the name of your active network (properties). Scroll down to the "IP Settings" section, where all the necessary numbers will be displayed in static or dynamic mode. For a more detailed analysis, you can use the command:
ipconfig /allThis command will show not only the IP, but also the MAC address, DNS servers, and lease times.
☑️ Network check in Windows
Viewing settings on Android and iPhone smartphones
Mobile devices also allow you to find out the current network configuration, although interfaces Android And iOS They vary. On an iPhone, tap the "i" icon in a blue circle next to the name of the connected Wi-Fi network in Settings. Under "IP Configuration," you'll see the address and mask. If it's set to "Automatic," the details may be hidden until you switch it to "Manual" (but don't save the changes unless you're sure!).
On Android, the path may differ depending on the manufacturer's shell (Samsung One UI, Xiaomi MIUI). Usually you need to go to Settings → Wi-Fi → Tap the network name (or gear) → AdvancedIn some Android versions, viewing the IP address and mask requires going to the "View QR Code" menu or using third-party utilities.
Useful diagnostic apps for mobile platforms:
- 📱 Fing — network scanner, shows all devices and their IP.
- 📱 WiFi Analyzer — analyzes channels and connection parameters.
- 📱 Network Analyzer — detailed technical information on TCP/IP.
Why might there not be a mask on the phone?
Some Android versions hide technical details (network mask, gateway) in the standard interface, showing only the "Connected" status. This is done to simplify the interface for regular users. To view the full data, use the apps listed above or log in to the router's web interface.
Checking via the router's web interface
The most complete control over the network is achieved through the router's admin panel. This is where the mask is set, which is then distributed to all clients. To log in, enter the gateway address in your browser (usually 192.168.0.1 or 192.168.1.1). The login and password are often indicated on a sticker on the bottom of the device.
After logging in, look for sections labeled "LAN," "Local Area Network," or "Network." In modern routers, Keenetic This could be the Home Network tab, and in TP-Link With the new firmware, go to "Network" → "LAN." Here you'll see a "Mask" or "Subnet Mask" field.
Typical settings for a home router:
| Parameter | Default value | Description |
|---|---|---|
| IP Address | 192.168.1.1 | The address of the router itself |
| Subnet Mask | 255.255.255.0 | Determines the size of the network |
| DHCP Server | Enable | Distributes addresses automatically |
| Start IP | 192.168.1.100 | Start of address pool |
Changing these settings will require rebooting the device and reconnecting all clients. Make sure you understand the implications before applying the changes.
⚠️ Attention: Router interfaces are constantly being updated. If you can't find the field you need, check the official instructions for your model on the manufacturer's website, as the menu layout may vary.
Common Addressing Errors and Conflicts
The most common problem is IP address conflicts. This occurs when two devices on the same network are assigned the same static address, or when the range DHCP Intersects with reserved static addresses. The mask here acts as a limiter: if it is set incorrectly, the device may assume that the other device is on a different network and will not attempt to connect.
Users often confuse the mask with DNS. DNS (Domain Name System) translates website names into IP addresses, while the mask defines the boundaries of a local network. If you can't access Google, but Skype or IP torrenting works, the problem is DNS, not the mask.
Symptoms of incorrect network configuration:
- ❌ The devices see the router, but there is no internet access.
- ❌ The printer is not located on the local network with the computer.
- ❌ Unstable connection speed and constant disconnections.
To reset network settings in Windows, you can use the command netsh int ip reset in the command prompt with administrator rights. This will reset TCP/IP settings to factory defaults.
Advanced Settings: VLANs and Subnets
Advanced users setting up a guest network or segmenting smart home devices may need to create multiple subnets. In this case, the default mask 255.255.255.0 is broken down into smaller segments. For example, a mask 255.255.255.128 (/25) will split the network into two ranges of 126 devices each.
This is beneficial for security: if a hacker compromises a smart bulb on a guest network, they won't be able to access your main computer with banking data, as they will be on different logical segments. Setting up such rules requires VLAN or Multiple SSID support on the router.
Corporate networks often use masks like 255.255.0.0 (/16), allowing for the connection of thousands of devices. In a home environment, this is excessive and even unsafe, as it increases the volume of broadcast traffic, which can clutter the network and reduce Wi-Fi performance.
What happens if you set the mask to 255.0.0.0?
This will combine over 16 million possible addresses into a single local network. On a home router, this will create a massive broadcast storm, as each device will constantly poll the network for the presence of others. Wi-Fi speed will drop to a crawl, and the router's web interface may become unresponsive.
Is it possible to find out the mask remotely?
No. The subnet mask is a local configuration parameter. For security reasons, it's impossible to see the subnet mask of your ISP or home router over the internet (WAN). You only see your external IP address.
Does the mask affect internet speed?
The mask itself doesn't affect the speed of the connection provided by the ISP. However, an incorrect mask can lead to packet loss within the local network, creating the illusion of a slow internet connection or causing page loading timeouts.
How to change a static IP on a computer?
In Windows, go to Control Panel → Network and Internet → Network and Sharing Center → Change adapter settingsRight-click on Wi-Fi → Properties → Internet Protocol Version 4 (TCP/IPv4)Select "Use the following IP address" and enter the data manually.