How to fix ERR_NAME_NOT_RESOLVED (Windows, Mac OS, Android, iOS)

Maybe the DNS is the reason for the ERR_NAME_NOT_RESOLVED error message. In this case, flushing it should be what you need to do, in order to fix it.

The don't know how to flush the DNS guide should be of great help, if you are not sure how to flush it.

A simple typo in the website's URL can be a reson for this error. In order to fix ERR_NAME_NOT_RESOLVED, ensure that there aren't typos in the URL and then hit the search button.

Maybe the reason why you get this error when trying to visit a website is the website itself. In a situation like this, consider contacting the website's admin and let them know about this issue. Since you can't access the website and get the admin's details, search for them in a search engine (Google, Yahoo, Bing, etc.).

Maybe a browser extension you recently installed is the reason for the ERR_NAME_NOT_RESOLVED error. Try disabling the extensions you recently installed, and if you were able to fix the error and identify the extension that was causing it, remove it.

Feel free to check the don't know how to enable/disable browser extensions guide, if you are not sure how to disable browser extensions.

If you want to remove an extension and you haven't done it before, the don't know how to remove browser extensions guide should help you.

The hosts file enables you to add URLs of webpages you want to block, which will automatically be blocked in every single browser installed in your computer. Also, some viruses can modify the hosts file in order to prevent you from downloading an antivirus software which can find and remove the virus.
 
All you have to do to fix this issue is to open and modify the hosts file. To modify the hosts file:

1.  Open the Terminal.app by going into Applications -> Utilities -> Terminal.
   
   
2. Type the following line: sudo nano /private/etc/hosts (type your username and password when asked)
   
   
3. If you notice a URL of a websites you visit, or websites of antivirus software, delete them and press and hold Control + O to save the changes and Control + X to exit
   
   
4. Flush the DNS cache by entering the following line (depending on your OS version):
   
   
   • dscacheutil -flushcache - Mac OS X Snow Leopard (v10.6 through v10.6.8)
     
     
   • sudo killall -HUP mDNSResponder - Mac OS X Mavericks, Mountain Lion, and Lion (v10.9.5 and earlier)
     
     
   • sudo discoveryutil mdnsflushcache - Mac OS X Yosemite and later (v10.10 through v10.10.3)
     
     
   • sudo killall -HUP mDNSResponder - Mac OS X Yosemite and later (v10.10.4 or later)

Maybe your router or modem, or both are the reason for the ERR_ADDRESS_UNREACHABLE error appeared. Try restarting the router and/or modem and check if it will do the trick.

Viruses can cause you a lot of headaches, as they tamper with the computer's settings. Try scanning your computer for viruses, using an antivirus software, and remove them, should you identify some.

Feel free to check out the virus removal and protection guide, to learn how to scan for and protect your computer from viruses.

If you have this issue only when using a particular web browser and the other ones work well, try reinstalling the browser. By reinstalling it, you will remove the culprit, too.

If you are not sure how to fully uninstall a web browser and delete all the files and settings associated with it, check out the don't know how to uninstall a program / an application guide.

Note: Please note that by reinstalling your browser you will lose personal data, such as browsing history, bookmarks, etc.

It is possible that the current DNS settings (an issue with them, to be precise) are the reason for the ERR_NAME_NOT_RESOLVED error message.

Try updating the DNS settings using the ones of Google (8.8.8.8 and 8.8.4.4 for IPv4 service, as well as 2001:4860:4860::8888 and 2001:4860:4860::8844, for IPv6 access).

If you are not sure how to change the DNS settings, check out the don't know how to change the DNS settings guide.

Maybe you get this error message because the DNS Client Service is not running. To check if it's running (and to enable it if it isn't), follow the steps below:

1. Go to the start menu and type Services;
2. Search for DNS Client in the list;
3. Check its current status (should be Running).
4. (IF it's not running) Right-click on DNS Client and select Properties;
5. Set Automatic under Startup type, click Start under Service status and apply the changes.

The hosts file enables you to add URLs of webpages you want to block, which will automatically be blocked in every single browser installed in your computer. Also, some viruses can modify the hosts file in order to prevent you from downloading an antivirus software which can find and remove the virus.
 
All you have to do to fix this issue is to open and modify the hosts file:

My Computer -> Local Disk (C:) -> Windows -> System32 -> drivers -> etc

Open the file with Notepad (right-click the hosts file -> Open with -> select Notepad). In the hosts file you will see other addresses which serve as an example and which you MUSTN'T delete. If you find a link associated with the website you want to open or with an antivirus software, delete it and save the changes.

To reset the network settings, and, very likely, fix this error message, follow the steps below:

1. Go to Settings, select General and tap on Reset
   
   
   
   
2. Select Reset Network Settings and confirm.
   
   

    
   
   

Note: If you reset the network settings, all the saved Wi-Fi passwords will be deleted.

Maybe the reason for the  ERR_NAME_NOT_RESOLVED error message is the cookies and cache files stored in your device.

To learn how to clear the browser's cache (and cookies), check out the don't know how to clear the cache solutions.