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How to Flush OS DNS Caches

Your DNS cache stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the webserver changes before the entry in your DNS cache updates, you can no longer access the site or hostname.

How to clear your DNS cache

The following methods allow you to remove old and inaccurate DNS information that will help fix connection issues.

ChromeOS

To clear your DNS cache if you use ChromeOS, perform the following steps:

  1. Open a new Chrome tab.
  2. Enter the following address 
    chrome://net-internals
  3. Hit the Enter key.
  4. From the menu, select DNS.
  5. Click the Clear host cache button.

If the command succeeds, the system will perform any DNS lookups again.

Windows® 7/10

To clear your DNS cache if you use Windows 7 or 10, perform the following steps:

  1. Click Start.
  2. Enter cmd in the Start menu search text box.
  3. Right-click Command Prompt and select Run as Administrator.
  4. Run the following command: 
    ipconfig /flushdns

If the command succeeds, the system returns the following message:

Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows XP®, 2000, or Vista

To clear your DNS cache if you use Windows XP, 2000, or Vista, perform the following steps:

  1. Click Start.
  2. On the Start menu, click Run.
  3. If you do not see the Run command in Vista, enter run in the Search bar.
  4. Run the following command in the Run text box:
    ipconfig /flushdns

If the command succeeds, the system returns the following message: 

Successfully flushed the DNS Resolver Cache.

MacOS® 10.10.4 and above

To clear your DNS cache if you use macOS X version 10.10.4 or above, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Click Terminal.
  4. Run the following command: 
    sudo killall -HUP mDNSResponder

If the command succeeds, the system does not return any output.

Warning:

To run this command, you must know the computer’s administrator account password.

MacOS® 10.10.1, 10.10.2, and 10.10.3

To clear your DNS cache if you use macOS X version 10.10 through 10.10.3, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Click Terminal.
  4. Run the following command:
    sudo discoveryutil mdnsflushcache

If the command succeeds, the system does not return any output.

Warning:

To run this command, you must know the computer’s administrator account password.

MacOS 10.7, 10.8, and 10.9

To clear your DNS cache if you use macOS X version 10.7, 10.8, or 10.9, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Double-click Terminal.
  4. Run the following command: 
    sudo killall -HUP mDNSResponder

If the command succeeds, the system does not return any output.

MacOS 10.5 and 10.6

  1.  To clear your DNS cache if you use macOS X version 10.5 or 10.6, perform the following steps: 

    1. Click Applications.
    2. Click Utilities.
    3. Double-click Terminal.
    4. Run the following command: 
      sudo dscacheutil -flushcache

     If the command succeeds, the system does not return any output.

     Warning:

    To run this command, you must know the computer’s administrator account password.

Ubuntu

  1.  To clear your DNS cache if you use Ubuntu, perform the following steps: 

    1. Run the following command: 
      sudo systemd-resolve --flush-caches
    2. Run the following command: 
      sudo systemd-resolve --statistics 

    If the command succeeds, it will return results with an empty cache.

CentOS

To clear your DNS cache if you use CentOS, run the following command:

systemctl restart dnsmasq.service

If the command succeeds, the system does not return any output.



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