The file hosts is a fundamental element of the network configuration in operating systems, including Android. It is a simple text database that matches domain names with IP addresses before the request goes to the ISP's DNS server. Many users look for this file to block system-level ads, speed up the loading of certain sites, or redirect traffic to debug applications.
However, unlike desktop operating systems, access to system files on mobile devices is strictly limited by Google's security policies. Finding a file hosts on Android is not as easy as on Windows, and standard file managers often show an empty folder or completely hide the system partition. To successfully work with this file, you will need not only to know the exact path, but also to understand what access rights are necessary to modify it.
In this article we will analyze in detail all the ways to detect and edit a configuration file, explain the difference between standard access and superuser mode, and also warn against errors that can lead to unstable network operation on your smartphone or tablet.
Android file system architecture and hosts location
The Android operating system is built on the Linux kernel, and its directory structure largely inherits the traditions of desktop distributions. The key feature is the division of space into a user part and a system part. File hosts resides on the system partition, which is mounted read-only by default. This is done to protect the integrity of the system from accidental changes or malware.
The standard path to the file is as follows: /system/etc/hosts. This is where the initial configuration is stored, which is loaded when the device starts. In some custom firmware or on devices with specific memory layout, the path may differ slightly, but the prefix /system remains an unchanged sign of the system file.
An attempt to open this file through a regular explorer, such as Google Files or the built-in Samsung manager, will lead to the fact that you either will not see folder etc, or you will not be able to save the changes. The system blocks writing to this directory for all processes running as a standard user. This is the first barrier that beginners encounter when trying to configure a firewall manually.
⚠️ Attention: Directly editing files in the /system section without creating a backup copy may lead to the device being bricked or losing access to the Internet. Always make a backup before making changes.
The need for root access to access system files
To fully work with a file hosts on Android in 99% of cases you need superuser rights, known as Root. Obtaining these rights removes access restrictions and allows you to mount the system partition in read-write mode. Without root access, you can only view the contents of the file using special utilities, but you will not be able to save the new configuration.
The rooting process varies depending on the device model and Android version. Popular tools such as Magisk or SUprovide a mechanism for managing privileges. After installing the superuser manager and obtaining access rights, you can use advanced file managers, for example Root Explorer or MT Manager, which can request elevated privileges when entering system folders.
It is important to understand that having root access opens the door not only to useful settings, but also to potential vulnerabilities. Applications with superuser rights can bypass bank protection or change critical system parameters. Therefore, the use of such rights must be conscious, and the file hosts should be edited only using proven methods.
Step-by-step guide for editing through the file manager
If your device already has activated superuser rights, the process of changing the file becomes quite simple, but requires care. You will need a file manager that supports root access. After launching the application, you need to grant it rights through the superuser manager pop-up window.
Next follow the procedure: go to the root of the disk, open the folder system, then the directory etc. Find the file named hosts (without extension). Before editing, it is recommended to copy the original file to any safe place, for example, to internal memory in a folder Download, under the name hosts_backup.
Open the file in a text editor inside the file manager. You will see a list of IP addresses and domains. Add new lines in the format: IP address, space, domain name. After making changes, be sure to save the file. If the manager requires you to restart the device to apply the settings, do it.
☑️ Checklist before editing
The syntax of the records in the file hosts strict. Each entry must be on a new line. Comments begin with a hash symbol #. An example of a correct entry for blocking a domain:
127.0.0.1 adserver.example.comThis command redirects all requests to adserver.example.com to the local address of the device, effectively blocking the connection. An error in spelling the IP address or extra spaces can lead to the rule not working or the system being unable to resolve the name at all.
Alternative method: using the AdAway application
For those who do not want to manually edit a text file and risk syntax errors, there is an excellent solution - the application AdAway. This open source utility automatically manages the file hostsby downloading ad blocking lists from trusted sources on the Internet.
The application works exclusively on devices with root access. When you first launch it, it will ask for superuser rights and offer to download basic host lists. After updating the lists, AdAway itself will generate a new file hosts and write it to the system partition /system/etc/, observing all the necessary access rights and formatting.
Using specialized software reduces the risk of human error. You don't have to remember IP addresses or search for the right domains manually. The application interface allows you to enable and disable list sources, as well as add your own exceptions to the “white list” if a site no longer opens correctly.
If, after enabling AdAway, a specific site stops working, add its domain to the “White List” section inside the application and update the hosts file.
The main advantage of this method is automation. Lists of ad servers are updated regularly, while manual editing requires constant monitoring of new domains from which advertising comes. This saves time and provides more comprehensive protection against unwanted content.
Editing without Root: using ADB and emulation
There is a situation when the user does not want or cannot get root access, but he needs to test changes in the file hosts. In this case, you can use the debugging tool Android Debug Bridge (ADB) from your computer. This method allows you to temporarily replace the hosts file without changing the system partition, but the changes are reset after a reboot.
To implement this method, you must enable “USB Debugging” in the “For Developers” menu on your smartphone. Connect your device to the PC where ADB is installed. Using the command adb push you can download the modified hosts file to a temporary directory, and then use the command adb shell to create a symbolic link or mount if the kernel allows it.
However, starting with Android 9 and later, the ability to manipulate system files through ADB without root is significantly limited due to increased security (SELinux, Verified Boot). Often the only working option without root is to use a local VPN application, which intercepts traffic and filters it according to rules, simulating the operation of the hosts file, but without directly affecting system files.
| Access method | Requirements | Persistence of changes | Complexity |
|---|---|---|---|
| Manual editing | root access, file manager | Constant | Average |
| Application AdAway | root access, Internet | Constantly (with auto-update) | Low |
| ADB (without Root) | PC, cable, USB debugging | Until reboot | High |
| Local VPN | Permission to create VPN | While the service is active | Low |
⚠️ Attention: The interfaces of the “For Developers” menu and the ADB command may differ on different versions of Android. Check the current commands for your firmware version in the official documentation.
Restoring the original hosts file
If after editing the file hosts you encounter problems accessing the Internet or running applications, you need to return the system to its original state. The most reliable way is to restore the file from a backup copy, which you should have created before starting work.
Using the same root file manager, find your backup (for example, hosts_backup). Copy it to the folder /system/etc/, rename it to hosts, replacing the current damaged file. Make sure that the access rights (permissions) of the recovered file match the original ones: usually this rw-r--r-- (644).
If the device boots in a bootloop due to an error in the syntax of the hosts file, you may need to enter Recovery mode. Through the console in recovery mode or using ADB in recovery mode, you can mount the system partition and replace the file manually. If you have TWRPinstalled, the built-in recovery file manager will also allow you to perform this operation.
What to do if there is no backup?
If you have not made a copy, try deleting the hosts file completely. The Android system, when loading, often creates a default empty file automatically if it detects its absence, which will restore access to the network, but without any blocking.
Frequent errors and problems when working with hosts
One of the most common errors is incorrect record format. Users often confuse the order of IP and domain, forget spaces between them, or use invalid characters. The file hosts does not forgive typos: one extra period can make the entire line invalid.
Another problem is related to DNS caching. Even if you edited the file correctly, the changes may not take effect immediately because browsers and applications cache DNS queries. In such cases, clearing the application cache or simply rebooting the device helps, which resets the network settings.
It is also worth considering that many modern applications use encrypted DNS queries (DoH - DNS over HTTPS). In this case, they ignore the local hosts file, accessing the protected servers directly. To block ads in such conditions, editing the hosts file alone may not be enough, and additional traffic filtering methods will be required.
The hosts file is only effective for regular DNS traffic. Applications that support DNS-over-HTTPS can bypass these rules, requiring more complex blocking solutions.
Is it possible to edit the hosts file on Android without root access?
Directly changing the system file /system/etc/hosts without root access is impossible due to Android kernel access restrictions. However, you can use applications that create a local VPN tunnel (for example, Blokada or DNS66), which emulate the operation of the hosts file, filtering traffic on the fly without changing system files.
Which IP address should I use to block sites in hosts?
To block domains, they usually use a local loopback address 127.0.0.1 or non-existent address 0.0.0.0. A record like 0.0.0.0 example.com forces the system to assume that the domain does not exist, which often works faster and more reliably than redirecting to a local server.
Why did the Internet stop working after editing hosts?
Most likely, you made a syntax error in the file that disrupted the parsing of the entire configuration, or blocked critical system domain (for example, Google update servers or time servers). Restore the original file from the backup to regain access to the network.
Where exactly is the hosts file located on different versions of Android?
The path to the file remains the same throughout all versions of Android: /system/etc/hosts. Only the methods of accessing it and the level of protection of the system partition change, which becomes stricter with each new version of the operating system.
Do you need to reboot the phone after changing the hosts?
In most cases, yes, a reboot is necessary for the system to re-read the configuration file and reset the DNS cache. Some applications may pick up changes immediately, but to ensure that the rules are applied throughout the system, it is recommended to perform a restart.