DNS Cache - NexonHost.com

How To Clear (Flush) The DNS Cache On Windows, MacOS, And LinuxThis article provides instructions on how to flush the DNS cache on different operating systems and web browsers.DNS cache is a temporary database that stores information about previous DNS lookups. In other words, whenever you visit a website, your OS and web browser will keep a record for the domain and the corresponding IP address. This eliminates the need for repetitive queries to the remote DNS servers and allows your OS or browser to resolve the website’s URL quickly.However, in some situations like troubleshooting network issues or after changing DNS resolvers, you will need to flush the DNS cache. This will clear the cached DNS entries and perform a subsequent lookup to resolve the domain based on newly configured DNS settings. Clear/Flush DNS Cache on WindowsThe process of clearing the DNS cache is the same for all Windows versions. You need to open the command prompt with administrator privileges and run ipconfig /flushdns. Windows 10 and Windows 8To clear the DNS cache in Windows 10 and 8, perform the following steps:Type cmd in the Windows search bar.Right-click on Command Prompt and click Run as administrator. This will open up the Command Prompt window.On the command line, type the following line and press Enter:ipconfig /flushdnsOn success, the system will return the following message:Windows IP Configuration Successfully flushed the DNS Resolver Cache. Windows 7To clear the DNS cache in Windows 7, perform the following steps:Click on the Start button.Type cmd in the Start menu search text box.Right-click on Command Prompt and click Run as administrator. This will open up the Command Prompt window.On the command line, type the following line and press Enter:ipconfig /flushdnsOn success, the system will return the following message:Windows IP Configuration Successfully flushed the DNS Resolver Cache. Clear/Flush DNS Cache on LinuxOn Linux, there is no OS-level DNS caching unless a caching service such as Systemd-Resolved, DNSMasq, or Nscd is installed and running. The process of clearing the DNS cache is different depending on the Linux distribution and the caching service you’re using. Systemd ResolvedMost modern Linux distributions such as Ubuntu 18.04 are using systemd resolved service to cache DNS entries.To find out whether the service is running use the following command:sudo systemctl is-active systemd-resolved.service If the service is running, the command will print active. Otherwise, you will see inactive.To clear the Systemd Resolved DNS cache, type:sudo systemd-resolve --flush-caches On success, the command doesn’t return any message. DNSMasqDnsmasq is a lightweight DHCP and DNS caching nameserver.If your system is using DNSMasq as a caching server, to clear the DNS cache you need to restart the Dnsmasq service:sudo systemctl restart dnsmasq.service Orsudo service dnsmasq restart NscdNscd is a caching daemon, and it is the preferred DNS caching system for most of RedHat-based distributions.If your system is using Nscd, to clear the DNS cache, you need to restart the Nscd service:sudo systemctl restart nscd.service Orsudo service nscd restart Clear/Flush DNS Cache on macOSThe command to flush cache in macOS is slightly different depending on the version you’re running. The command must be executed as a user with system administrator privileges (sudo user).To clear the DNS cache in macOS, perform the following steps:Open the Finder.Go to Applications > Utilities > Terminal. This will open up the Terminal window.In the command line, type the following line and press Enter:sudo killall -HUP mDNSResponderEnter your sudo password, and hit Enter again. On success, the system doesn’t return any message.For earlier versions of macOS, the command to flush cache is different.macOS version 10.11 and 10.9sudo dscacheutil -flushcache sudo killall -HUP mDNSResponder macOS version 10.10sudo discoveryutil mdnsflushcache sudo discoveryutil udnsflushcaches macOS version 10.6 and 10.5sudo dscacheutil -flushcache Clear/Flush Browser DNS CacheMost modern Web browsers have a built-in DNS client to prevent repetitive queries each time the website is visited. Google ChromeTo clear Google Chrome’s DNS cache, perform the following steps:Open a new tab and type chrome://net-internals/#dns in Chrome’s address bar.Click the “Clear host cache” button.If that doesn’t work for you, try to clear the cache and cookies.Open the “Clear browsing data” dialog window with CTRL+Shift+Del.Choose a time range. Select “All time” to delete everything.Check the “Cookies and other site data” and “Cached images and files” boxes.Click the “Clear data” button.This method should work for all Chrome-based browsers, including Chromium , Vivaldi, and Opera . FirefoxTo clear Firefox’s DNS cache, perform the following steps:In the upper right-hand corner, click on the hamburger icon ☰ to open Firefox’s menu:Click on the ⚙ Options (Preferences) link.Click the Privacy & Security or Privacy tab on the left.Scroll down to the History section and click on the Clear History... button.Choose a time range to clear. Select “Everything” to delete everything.Select all boxes and click “Clear Now”.If that doesn’t work for you, try the following method and temporally disabled the DNS cache.Open a new tab and type about:config in Firefox’s address bar.Search for network.dnsCacheExpiration, temporally set the value to 0 and click OK. Afterward, change back the default value and click OK.Search for network.dnsCacheEntries, temporally set the value to 0 and click OK. Afterward, change back the default value and click OK. ConclusionWe’ve shown you how to clear or flush DNS cache on Windows, Linux, and macOS operating systems.

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