Many advanced mobile device users are faced with the need to block ads, restrict access to certain servers, or redirect domain names. To solve these problems, the operating system Android, as in desktop OSes, uses a system file hosts. However, unlike computers, access to this file on smartphones and tablets is often limited by the platform's security policies. Understanding where this file is physically located and how to access it is the first step to deeply customizing your gadget's network experience.
By default, this text document is hidden from normal viewing through file managers installed from the application store. The system protects critical configuration files from accidental changes that could lead to loss of network connectivity. To find and modify hosts, the user will need not only knowledge of the exact path in the file system, but also special rights or software capable of working with the system partition. In this article we will analyze in detail the directory structure and methods of interaction with this important component of the network.
It is worth noting right away that the editing procedure may vary depending on the version Android and the manufacturer's shell. With new versions of the operating system, security mechanisms are becoming stricter, which requires a more careful approach. If you plan to make changes, make sure you have a backup copy of the original file. An error in the syntax can cause the device to stop resolving domain names, making it impossible to surf the Internet even if there is an active connection to Wi-Fi or a mobile network.
The standard path to the hosts file in the file system
In the operating system architecture Android, which is based on kernel Linux, system files have a strictly defined hierarchy. The file hosts is no exception and is located in a directory standard for Unix-like systems. The absolute path to it looks like this: /system/etc/hosts. This is where the table of correspondence between IP addresses and domain names is stored, which the operating system checks before sending a DNS request to the external network.
An attempt to open this directory through a standard file explorer, such as Files by Google or the built-in Samsung manager will most likely lead to failure. You will either not see the folder system, or the system will display an access error message when you try to log in. This is due to the fact that the partition /system is mounted read-only (read-only) in normal operation mode of the device. To make any changes to this directory, you must change the access rights to the partition or have superuser privileges.
⚠️ Attention: Directly editing a file in the directory
/system/etc/without creating a backup copy may lead to inoperability of the network modules. Always save the original file under a different name, for examplehosts.bakbefore making changes.
There is also an alternative path that is sometimes used in custom firmware or specific builds: /system/vendor/etc/hosts. However, the vast majority of stock firmware from large vendors, such as Xiaomi, Samsung or Pixel, uses the classic path. Knowing the exact location is necessary for the correct operation of automation scripts and specialized applications that manipulate network settings at a low level.
If you are using a terminal on the device, the command to check the existence of the file can be executed like this: ls -l /system/etc/hosts. This will show the access rights and owner of the file.
The need for root access to edit the configuration
The main obstacle to changing the file hosts is the lack of superuser rights, known as Root. Without obtaining these privileges, the user cannot mount the system partition in write mode (read-write). Standard applications run in an isolated environment (sandbox) and do not have access to the root file system. Therefore, the question “where is the hosts file” is often transformed into the question “how to get root access.”
The process of rooting a device varies depending on the model and manufacturer. For some smartphones, this is a simple procedure for unlocking the bootloader and installing MagiSU or SuperSU, for others it is an almost impossible task due to hardware locks. If your device is already rooted, then editing the file becomes a trivial task, completed in a couple of minutes using specialized editors. Otherwise, you will have to look for workarounds or accept the limitations of the standard security system.
- 🔓 Root access Gives full control over the file system, allowing you to change any system files, including hosts.
- 🛡️ Without Root Direct access to
/system/etc/hostsis closed, and standard editing methods are not will work. - ⚠️ Warranty: obtaining superuser rights often voids the manufacturer's warranty on the device.
- 🔄 OTA updates: after modifying system files, automatic system updates may no longer install correctly.
It is important to understand that even with root access, modern versions Android (starting from 10 and higher) use the mechanism system-as-root and download verification (Verified Boot). This means that any change to the partition /system might be undone on a reboot or cause a system integrity error. In such cases, the use of special mechanisms is required, such as Magisk, which allow you to make changes in a system-seamless way, without directly modifying the partition itself, but replacing its contents on the fly.
Instructions for changing a file with Root access
If your device already has the necessary privileges, the editing process becomes technically simple, but requiring attention. You will need a file manager that supports working in superuser mode, for example Root Explorer, Solid Explorer or MT Manager. After launching the application, you must grant it root access through the pop-up window requesting privileges.
Next you should follow the path /system/etc/ and find the file hosts. Before opening, make sure that the file manager has switched the partition access mode to Read/Write (R/W). Usually there is a special button for this in the app interface. Open the file with the built-in text editor. You will see a list of IP addresses and domains. To block a site, you need to add a new line in the format: 127.0.0.1 site-address.com. This will redirect requests to this domain to the local device, effectively blocking the connection.
☑️ Checklist before editing hosts
After making all the necessary changes, save the file. It is critical to check the permissions of the saved file. They must remain unchanged: usually this is -rw-r--r-- (644), owner root, group root. If the permissions change, the system may not read the file when downloading. After saving, reboot your device for the changes to take effect and the DNS cache to clear.
# Example of an ad blocking record127.0.0.1 adserver.example.com
127.0.0.1 tracking.analytics.net
⚠️ Attention: Never delete standard records at the beginning of the file, especially the line
127.0.0.1 localhost. Removing it may disrupt the operation of local network services and some system applications.
Alternative methods without obtaining root access
For users who do not want or cannot root their device, there are workarounds. They do not change the physical file in the partition /system, but emulate its operation at the network stack level. The most popular method is to use applications like AdAway in non-root mode (if supported) or use local VPN services that intercept DNS requests and filter them according to their own block lists.
Another way is to use the function Private DNS (Private DNS), available in the settings of Android 9 and higher. While this does not edit the hosts file directly, it does allow all DNS requests to be redirected to the server that does the filtering (e.g. dns.adguard.com). This is an effective alternative that does not require intervention in system files and does not violate the integrity of the firmware.
You can also use software debugging capabilities ADB (Android Debug Bridge) from your computer. In some cases, if you have an unlocked bootloader but no full root, you can temporarily remount the partition or use commands to apply hosts from user space, although this method is complex and depends on the specific device model.
| Method | Requirements | Efficiency | Complexity |
|---|---|---|---|
| Direct editing | root access | High (system) | Average |
| Private DNS | Android 9+ | High (network) | Low |
| Local VPN | Application | Medium | Low |
| ADB commands | PC, debugging | Depends on the model | High |
Why is Private DNS better for beginners?
Using Private DNS does not require intervention in system files, does not void the warranty and can be easily disabled in one click in network settings. This is the safest way to block ads and trackers for the average user.
Using specialized applications for management
Manually editing a text file is subject to human error: you can accidentally remove a space, break the syntax, or forget to save access rights. To avoid these errors, it is advisable to use specialized utilities such as Hosts Editor, AdAway or System Hosts Editor. These applications automatically find the path to the file /system/etc/hosts, request root access and provide a convenient interface for adding and deleting entries.
Such apps often have built-in domain databases to block ads, trackers and malicious sites. The user just needs to press one button to update the lists, and the application itself will generate the correct hosts file. In addition, they usually create a restore point that allows you to roll back changes if network problems occur. This greatly simplifies the process of managing network rules for inexperienced users.
When choosing an application, pay attention to the date of the last update in the store Google Play or repository F-Droid. Outdated applications may not work correctly on new versions Android due to changes in methods for obtaining root access or the file system structure. Modern versions of Android often change the way partitions are mounted, so older editors may simply not see the hosts file.
Specialized applications minimize the risk of errors when editing, automatically save backup copies and simplify the management of block lists.
Possible problems and ways to resolve them
After modifying the hosts file, users may encounter a number of problems. The most common of them is a complete lack of access to the Internet, despite working Wi-Fi. This often happens if there is a syntax error in the file or critical system domains required for Google services or device activation are blocked.
The second problem is the system ignoring changes. This may be due to the fact that the partition /system was not remounted correctly into write mode, or the changes were overwritten during a reboot due to verification being enabled. In such cases, the file reverts to its original state and the lock does not work. It is also possible to cache DNS at the application or modem level, which requires additional cache clearing.
- 🚫 No Internet: Check if you have blocked Google domains (google.com, android.com) or time servers.
- 🔄 Changes reset: Make sure you are using Magisk for system changes on Android 10+.
- ⚡ DNS cache: use terminal commands or reboot to reset cached entries.
- 📱 Applications do not work: some applications check the integrity of system files and may refuse to start.
To diagnose problems, you can use the terminal and command ping or nslookup to check name resolution. If the domain does not resolve or points to the wrong IP, then the hosts file is working, but may contain an error. As a last resort, if the device has lost the network and does not boot correctly, you may need to boot into Recovery mode and restore the original hosts file from the backup via ADB.
⚠️ Attention: Settings interfaces and system behavior may differ depending on the version of Android and the manufacturer's shell. Always check the documentation for your specific device model before making deep system changes.
After editing the hosts, it is useful to run the command "adb shell ndc resolver cleardefaultdns" or simply reboot the device to ensure the DNS cache is cleared and the new rules are applied.
Questions and answers (FAQ)
Is it possible to edit the hosts file on Android without root access?
Direct editing of the system file /system/etc/hosts without root access is impossible due to security restrictions of the Linux kernel. However, you can achieve a similar effect by using the "Private DNS" setting in the network settings or by installing a local VPN application that filters traffic at the device level without requiring access to the system partition.
Which IP address should I use to block sites in hosts?
To block a domain, you need to redirect it to the local loopback address. The standard and most secure address is 127.0.0.1. The entry in the file should look like this: 127.0.0.1 domain-to-block.com. Using the address 0.0.0.0 is also possible and sometimes works faster, since it does not create a network connection, but 127.0.0.1 is a universal standard.
Why did hosts stop working after editing? Internet?
Most likely, you accidentally blocked system domains necessary for the operation of Android network services or Google services. Check the file for entries blocking google.com, android.com, gstatic.com or time servers. Restore the original file from a backup or delete suspicious lines to regain access to the network.
Where is the backup copy of the hosts file?
The Android system does not automatically create backup copies of the hosts file when the user changes it. A backup copy is created only by specialized software (for example, AdAway or Root Explorer) before making changes, usually saving it in the same folder or in the internal memory of the application. If you edited the file manually and did not make a copy, you can only restore the original by flashing the device or extracting the file from the stock firmware. hosts.bak in the same folder /system/etc/ or in the internal memory of the application. If you edited the file manually and did not make a copy, you can only restore the original by flashing the device or extracting the file from the stock firmware.
Does the hosts file affect the operation of mobile data and Wi-Fi equally?
Yes, the file hosts is processed at the operating system level before the request goes to the network. Therefore, the rules prescribed in it apply equally to all network interfaces of the device: be it a Wi-Fi connection, mobile data (4G/5G) or Ethernet. The blocking will apply globally for all applications using the standard Android network stack.