In today's digital world, a stable Internet connection is a critical element of the operation of any smartphone. However, when connection problems arise, speed drops, or devices do not see each other on the local network, the user has to delve into technical settings. One of the key characteristics of any network is subnet maskwhich defines the boundaries of the local segment and data routing rules.
Most owners of Androiddevices are not even aware of the existence of this parameter until they are faced with the need to manually configure an IP address or diagnose complex network failures. Knowing how to find this information can be a lifesaver when setting up your smart home, printers, or game servers. In this article, we'll look at all the available methods for obtaining subnet mask information, from simple settings menus to advanced developer tools.
Understanding the structure of your network helps not only in troubleshooting, but also in ensuring the security of your home connection. An incorrectly configured mask can result in your phone simply not being able to “see” the router or other gadgets in the apartment. Let's take a look at where this data is hidden and how to interpret it correctly to solve your problems.
What is a subnet mask and why does the phone need it
A subnet mask is a bit mask that determines which part of the IP address is the network address and which part is the host address on that network. In simple words, this is a filter that tells your smartphone: “All devices with addresses in this range are nearby, communicate with them directly, and send the rest through the gateway.” Without the correct mask, the device will not be able to correctly determine whether the target server is on a local network or on the global Internet.
In the protocol IPv4, which is still the main one for home networks, the mask most often looks like a sequence of four numbers, for example, 255.255.255.0. This value indicates that the first three octets of the address are reserved for network identification, and the last octet is reserved for specific device addresses. In more complex corporate or provider networks, this configuration may differ significantly, which requires careful study of the parameters.
For the operating system Android this information is necessary to build a routing table. When you send a request, the system checks the recipient's address against the subnet mask. If the address falls within the local network range, the phone tries to find the device through ARP requests. If not, the data packet is redirected to the default gateway, that is, to your router. An error in this setting will result in a complete loss of connection or inability to access local resources.
⚠️ Warning: Never change the subnet mask manually unless you have the exact details from your ISP or system administrator. An incorrect value can completely isolate the device from the network.
The easiest way: viewing through the Wi-Fi settings
The most obvious and accessible method of checking network parameters is hidden right in the standard system interface. Smartphone manufacturers often hide detailed information deep in menus, but basic connection information is available to everyone. To find out the subnet mask, you need to connect to an active Wi-Fi network, since in mobile data mode (LTE/5G) this data is often hidden from the user or dynamically changed by the operator.
The process may vary slightly depending on the manufacturer's shell, be it pure Android, One UI from Samsung or MIUI from Xiaomi. However, the logic remains the same: you need to find an active connection and reveal its properties. Typically the path looks like this: go to Settings → Connections (or Network and Internet) → Wi-Fi. Here you will see a list of available networks and the one you are currently connected to.
Click on the name of your network or the gear icon next to it. The Network Information or Status screen appears. Scroll down to the IP Settings or Advanced section. It is here, next to the “IP address” field, that the “Subnet Mask” or “Network Mask” line is often located. If you see a value like 255.255.255.0there, then you have found the information you need.
On some smartphones, the subnet mask information is hidden behind the "Advanced" or "Expand" button at the bottom of the network information screen. Don’t be lazy to scroll through the menu to the very end.
It is worth noting that in the latest versions Android (starting from 10 and higher), some manufacturers have simplified the interface, hiding technical details from the average user. In this case, you can only see the IP address and gateway, but not the mask. This does not mean that the data is not available to the system, just that the interface does not display it explicitly. For such cases, there are alternative methods, which we will talk about later.
Using third-party applications for network diagnostics
If standard settings do not give the full picture, specialized utilities from the store come to the rescue. Google Play. There are many free applications that scan the network and display comprehensive information about all connection parameters, including DNS servers, MAC addresses and, of course, the subnet mask. These tools are often used by network engineers for quick diagnostics.
One of the most popular and reliable solutions is the application Network Analyzer or Fing. After installation and launch, the app automatically detects your current connection. You don't need to enter any commands - just click the "Scan" button or go to the "Tools" → "Device Information" tab. The list that opens will clearly indicate the subheading “Subnet Mask” with the corresponding numerical value.
The advantage of using such applications is clarity. They don't just show numbers, but often visualize the network structure, showing which devices are on the same segment. This is especially useful if you are setting up a local server or trying to connect a network printer. In addition, these utilities work regardless of the Android version and phone model, providing a single standard for displaying data.
- 📱 Universality: Applications work on any device with access to Google Play, regardless of the brand.
- 🔍 Detail: Show not only the mask, but also the network class, broadcast address and available ports.
- 🚀 Speed: Receiving information takes a few seconds without having to delve into system menus.
Advanced method: obtaining data via ADB
For users who are not afraid of the command line and want to get “raw” data directly from the system kernel, there is a method with using Android Debug Bridge (ADB). This method requires connecting the phone to the computer via a USB cable and first activating the debugging mode. It is ideal for situations where the interface is blocked or menu information is not displayed correctly.
You must first enable USB debugging. To do this, go to Settings → About phone and quickly click on the build number seven times to activate the developer menu. Then go to System → For developers and turn on the “USB Debugging” switch. Connect your smartphone to a PC on which the Android SDK platform tools package is installed.
Open a terminal or command line on your computer and enter the command to enter the device shell:
adb shellAfter successful connection, when the symbol $ or #appears in the line, enter the command to display information about network interfaces:
ip addr showIn response, the system will display a detailed list of all interfaces. Find the block that matches your Wi-Fi connection (usually called wlan0). In the line with the address inet you will see the IP address and, separated by a slash, a number indicating the length of the mask (for example, /24). The number 24 corresponds to the mask 255.255.255.0.
Deciphering the mask prefixes
The number after the slash (/24, /16, /8) indicates the number of unit bits in the mask. /24 = 255.255.255.0, /16 = 255.255.0.0, /8 = 255.0.0.0. This is a standard CIDR record.
Analysis of parameters through the terminal on the device itself
If you do not have a computer at hand, but have superuser rights (Root) or simply want to use the system's capabilities to the maximum, you can install a terminal emulator directly on your smartphone. Apps like Termux allow you to run a variety of Linux utilities directly on Android, turning your phone into a powerful diagnostic tool.
Once installed Termux and granted the necessary permissions, you can use the same commands as in ADB, but locally. Enter the command ifconfig (you may need to install the net-tools package) or a more modern one ip addr. The system will produce a data structure similar to what we saw when connecting via a PC. This is a great way to test your settings without depending on external peripherals.
It is important to understand that without root access, some commands may return truncated information or require additional confirmation. However, basic network interface data wlan0 usually available to all users. This method is especially valuable for system administrators who manage a fleet of devices and need quick access to technical information “in the fields.”
⚠️ Attention: Working in the terminal requires caution. Entering incorrect commands with superuser rights can disrupt the operation of network services or lead to system instability.
Summary table of masks and prefixes
When diagnosing a network, you may encounter different formats for recording the subnet mask. In router settings or in command output, CIDR (number after a slash) notation is often used, while in the Android interface the format of four numbers is more common. So that you do not have to calculate the values manually each time, we have prepared a table corresponding to the most common masks.
| Prefix (CIDR) | Subnet mask (DEC) | Number of hosts | Network type |
|---|---|---|---|
| /8 | 255.0.0.0 | 16 777 214 | Class A (Large providers) |
| /16 | 255.255.0.0 | 65 534 | Class B (Corporate networks) |
| /24 | 255.255.255.0 | 254 | Class C (Home networks) |
| /30 | 255.255.255.252 | 2 | Point-to-Point connections |
Knowing this table will help you quickly understand the scale your network. If you see a mask 255.255.255.0, it means that theoretically there can be up to 254 devices on your local network. For an ordinary apartment this is more than enough. If the mask is shorter, for example 255.255.0.0, this may indicate a specific provider configuration or a large office infrastructure.
For 95% of home users, the standard and correct subnet mask is 255.255.255.0 (or /24). Any deviations require checking with your Internet provider.
Frequent problems and ways to solve them
Sometimes users are faced with a situation where the phone is connected to Wi-Fi, the network icon is there, but the Internet does not work, or the devices do not see each other. Often the root of the problem lies precisely in the conflict of subnet masks. For example, if your router distributes addresses with a mask /24, and you manually registered a mask on your phone /16, the device will look for other gadgets in the wrong network segment, which will lead to communication errors.
Another common problem occurs when using a static IP address. If you moved to a new office or changed your router, old saved settings may conflict with the new network. In this case, it is recommended to reset the network settings. In the menu Settings → System → Reset settings select “Reset Wi-Fi, mobile data and Bluetooth settings”. This will return all parameters, including the mask, to be automatically received via DHCP.
- 🔄 Address conflict: Two devices with the same IP in the same subnet are blocking each other's work.
- 🚫 Incorrect gateway: Even with the correct mask, an error in the gateway address will not allow access to the Internet.
- 📶 Weak signal: Sometimes the problem imitates a network error, but is actually caused by physical obstacles.
☑️ Connection diagnostics
Remember that network settings may change depending on firmware updates for your smartphone or changes in your provider’s equipment. If you notice that previously working options have stopped working, don't try to guess the solution. It is best to consult the documentation of your router or the technical support of your service provider to obtain the latest data.
Why don’t I see the “Subnet Mask” field in the settings of my Xiaomi?
In the MIUI shell, information about the subnet mask is often hidden. Try clicking on the arrow next to the IP address or going to the status bar by clicking on the Wi-Fi icon. If there is no data there either, use the Network Analyzer application, since Xiaomi often cuts down system menus.
Is it possible to change the subnet mask to speed up the Internet?
No, the subnet mask does not affect the Internet speed. It only defines the routing logic within the network. Changing this parameter without good reason will result in a loss of connection, but will not give an increase in speed.
What does the mask 255.255.255.255 mean?
This mask means that there can only be one device (host) on the network. This is usually used for special routes or addressing the interface itself, but not for a regular home network.
How to find the subnet mask if Wi-Fi is not connected?
Without an active connection to the network, it is impossible to find out the current subnet mask for this interface, since the parameters are issued by the router at the time of connection (via DHCP). You can view your saved settings in the Manage Saved Networks menu, but they may be out of date.
Does the subnet mask affect how the VPN works?
The VPN creates a virtual interface with its own subnet mask, independent of your physical network. Therefore, your home Wi-Fi mask settings do not affect the operation of the VPN tunnel, unless you configure complex routes manually.