Modern operating system-based smartphones Android accumulate a huge amount of temporary data during their operation. One of these hidden but important elements is DNS cache, which stores correspondence between site domain names and their IP addresses. This system is designed to speed up the loading of web pages so that the device does not have to request the address from remote servers each time.
However, over time, this database can become outdated or damaged, which leads to the inability to open certain sites or connection errors. Users often encounter a situation where the Internet seems to be working, but specific resources are not loading, and in such cases it is necessary clear DNS cache on Android manually. This action is one of the first steps when diagnosing network problems.
Unlike desktop computers, mobile devices do not have a single simple button for this operation in the standard settings menu. The process depends on the firmware version, superuser rights and the specific smartphone model. In this article, we will look at all available methods, from switching network modes to using professional debugging tools.
Operating principle and causes of DNS failure
The Domain Name System functions like the Internet phone book. When you enter a website address in your browser, your device first accesses local storage. If the entry is there and it is current, the connection is established instantly. If the record is missing or outdated, the request goes to the provider. The problem occurs when the IP address of the site has changed on the server, and the old address remains in your cache cache
In such cases, the phone persistently tries to connect along the wrong path, giving the error “Site not found” or endless loading. This often happens after moving a site to a new hosting or when changing the DNS provider to a faster one, for example Google DNS or Cloudflare. Failures can also be caused by software errors in the operating system itself or conflicts after updating applications.
Another common reason is the use of VPN services or ad blockers that intercept DNS requests. If such apps are terminated incorrectly, “broken” records may remain in memory. That is why regular network maintenance sometimes requires a complete reset of this temporary data to restore normal surfing speed.
⚠️ Attention: Clearing the DNS cache does not delete your personal files, photos or contacts. This is a technical procedure that affects only network settings and temporary system files.
Before performing complex actions, try simply rebooting the router and phone - in 50% of cases this automatically updates network entries without interfering with the system.
The simplest method: Airplane mode and reboot
Before resorting to complex technical manipulations, it is worth trying the simplest methods, which are often effective. Switching airplane mode causes the smartphone's radio module to completely turn off and then re-register with the operator's network. This process initiates a request for new network parameters, including updating routing tables.
To perform this action, lower the notification shade and look for the airplane icon. Click on it to activate the mode and wait about 10-15 seconds. During this time, all network interfaces, including Wi-Fi and mobile data, will be completely de-energized. After that, disable Airplane mode and wait for the network icons to appear.
If the problem persisted due to a temporary hang of the network stack, this method should help. It is important to understand that this does not guarantee a complete clearing of the deep system cache, but it will often resolve problems with specific hung sessions. If the site still does not open, move on to deeper configuration methods.
- ✈️ Activate airplane mode through the control center.
- ⏳ Wait at least 10 seconds before turning off.
- 🔄 Wait until the 4G or 5G signal is fully restored.
Changing the DNS server in Wi-Fi settings
One of the most effective ways to force update network settings is to manually change the DNS server. When you change the server address in the settings of a specific Wi-Fi network, the system Android is forced to rebuild the correspondence table and ignore old entries received from the previous provider. This method works on most modern versions of the system without the need to obtain root access.
Go to the section Settings and select item Wi-Fi. Find the network you are currently connected to and hold your finger on it (or click on the gear icon, depending on the interface). In the menu that appears, select "Change Network" or "IP Settings". You will need to switch the IP parameter from DHCP to Static.
In the fields that open, scroll down to the DNS section. Enter the addresses of trusted public servers. For example, for Google it 8.8.8.8 and 8.8.4.4, and for Cloudflare - 1.1.1.1. After saving the settings, the phone will break the connection and reconnect using the new addresses to resolve domain names, which essentially resets the old cache for this network.
| DNS Provider | Primary address | Alternate address | Features |
|---|---|---|---|
| Google Public DNS | 8.8.8.8 | 8.8.4.4 | High speed and stability |
| Cloudflare | 1.1.1.1 | 1.0.0.1 | Emphasis on privacy and protection |
| OpenDNS | 208.67.222.222 | 208.67.220.220 | Built-in content filtering |
| Quad9 | 9.9.9.9 | 149.112.112.112 | Blocking malicious domains |
⚠️ Attention: When switching to a static IP, make sure that you have not changed the default gateway, otherwise the Internet may completely abyss. Change only the DNS 1 and DNS 2 fields.
Using private DNS (Android 9 and higher)
Starting with version Android 9 Pie, the system has added the "Private DNS" function, which encrypts DNS queries and allows you to easily manage them at the level of the entire system, rather than a separate Wi-Fi network. Using this function automatically invalidates the old cache, as the protocol for obtaining addresses changes. This is a more modern and secure way to solve problems.
To use this tool, go to Settings -> Connections (or "Network and Internet"). Find the item Private DNS. By default it is usually set to "Auto". You need to select the "Provider Hostname" mode and enter the address of the supported service. A popular option is dns.google or 1dot1dot1dot1.cloudflare-dns.com.
After entering the host name and saving, the system will immediately apply the new settings to all network interfaces, including the mobile data. Old entries will be ignored as requests will now go through an encrypted tunnel to the specified provider. If after entering the address the Internet disappears, return the setting to “Auto” or “Disabled” mode.
What is DoT (DNS over TLS)?
This is a technology for encrypting DNS requests that prevents data interception by the provider and protects against spoofing of website addresses by attackers. It is enabled precisely through the Private DNS setting.
Resetting network settings to factory settings
If targeted methods do not help, you can completely reset all network settings of the device. This procedure will return the Wi-Fi, Bluetooth and mobile data configuration to the state it was in right after you purchased the phone. This is guaranteed clears the DNS cache on Androidas it deletes all accumulated temporary files of the network subsystem.
Find the section System or General settingsin the settings menu. Next, select Reset or Recovery and reset. You need the item "Reset Wi-Fi, mobile data and Bluetooth settings." Click on it and confirm the action. The phone may require you to enter a screen unlock PIN.
After rebooting, you will have to re-enter passwords for all Wi-Fi networks and re-pair Bluetooth headsets or watches. However, this often resolves complex connectivity issues that cannot be resolved by other means. This is a radical, but very effective method for clearing system errors.
☑️ Preparing to reset the network
⚠️ Attention: Resetting network settings does not delete your apps, photos or contacts. It only affects connection settings. However, saved Wi-Fi passwords will be permanently deleted.
Advanced method: Cleaning via ADB
For users who are not afraid to work with the computer and the command line, there is the most reliable way to clear the cache without resetting all settings. The tool Android Debug Bridge (ADB) allows you to send direct commands to the system. This method requires enabling USB debugging mode in the "For Developers" menu.
Connect your smartphone to the computer with a cable and open the command line or terminal on the PC with ADB installed. Enter the command to restart the network service, which will force its memory to be cleared. The command may look different depending on the system version, but a universal option is to restart the network daemon.
adb shell svc wifi disable && adb shell svc wifi enableOr a deeper command to reset network interfaces:
adb shell netcfgYou can also try clearing the cache of a specific application, if the problem occurs only in one browser, through the command adb shell pm clear com.android.chrome (replacing the package name with the desired one). This method gives complete control over the process and allows you to avoid unnecessary rebooting of the entire phone if you are an experienced user.
Using ADB is the most professional method that allows you to precisely manage network services without losing saved Wi-Fi passwords, but requires a PC and drivers.
Frequently asked questions and problems
Why did the Internet become slower after clearing the DNS cache?
In the first minutes after clearing, the speed may seem lower, since the device has to re-request IP addresses for all visited sites. This is normal. After some time, the cache will be filled with up-to-date data, and the speed will return to normal or even become higher if you changed the DNS to a faster one.
Is it possible to clear the DNS cache without root access?
Yes, absolutely. Methods using airplane mode, changing DNS in Wi-Fi settings, using private DNS, or completely resetting network settings do not require root access. Only some specific commands via the terminal on the phone itself may require root, but via ADB from a computer this is often bypassed.
How often should this procedure be performed?
There is no need for special cleaning on a regular basis. Do this only if problems arise: sites do not load, DNS_PROBE_FINISHED_NXDOMAIN errors appear, or the connection is unstable. In normal mode, the system itself manages the relevance of records.
Does clearing DNS affect the mobile data (4G/5G)?
Yes, it does. The DNS cache is the same for all interfaces in most versions of Android, or is reset when switching between them. Changing DNS settings or resetting the network updates records for both Wi-Fi and mobile data of the telecom operator.
What to do if nothing helps?
If none of the methods solved the problem, it may not be a cache issue, but a blocking on the part of the provider, a faulty router, or a hardware problem with the smartphone. Try checking the site from another device on the same network or contact technical support of your operator.