A Quick Guide on Clearing DNS Cache

Flush DNS - How and why to clear your DNS cache - What's My DNS?

Facing connectivity or speed issues? It could be because of networking problems or the DNS cache that requires to be flushed. You may also need to clean the DNS cache if you have recently shifted to a new server. The process of clearing the DNS cache is simple but you can always approach your dedicated server hosting provider for doing the same. Before you learn the process of clearing the DNS cache, you need to understand what exactly is DNS cache?

What is DNS Cache?

DNS (Domain Name System) Cache is a temporary database maintained by your computer’s operating system and contains records of all the websites recently visited by you. It also includes details of websites that you have attempted to visit recently. This database is used by your computer while trying to load the same sites again. Consisting of compressed information units or resource records of all visited websites, the Cache is displayed in ASCII code. The more the information is saved in your DNS cache, the slower is the speed of browsing. This can be resolved by deleting the cache data which in turn improves the loading time of web pages.

Need to Flush DNS Cache

When the operating system stores all the records related to the websites visited by you for a long time, the server gets burdened. To reduce the DNS server’s burden and maintain its speed and performance, the operating systems perform DNS caching. The validity period of the cache is determined by its TTL or Time to Life. This means that a cache file will answer content requests without going through the DNS dedicated server only till the time it is valid.

The flushing of your DNS cache from time to time is recommended to:

  • Prevent hackers from tracking your browser history.
  • Prevent errors like 304.
  • Prevent DNS spoofing which can put your sensitive information like login and personal data at risk.
  • Resolve connection issues and prevent the display of incorrect and outdated content.

How to Flush DNS Cache?

The steps to flush DNS Cache may vary from one operating system to another.

  • In the case of Microsoft Windows, you can flush the local DNS cache by using the ipconfig /flushdns command in a Command Prompt. This is followed by the message that the Windows IP configuration successfully flushed the DNS Resolver Cache.
  • In the case of macOs, the users should use dscacheutil-flushcache command to flush the DNS cache. But there is no successful message after this.
  • If you are using Linux operating system, the command for flushing DNS Cache is given by opening the command line interface. The command to be used is:  /etc/rc.d/init.d/nscd restart command. The exact command will, however vary on the Linux distribution. Do check this when you buy a hosting plan for your website.
  • If you wish to clear the DNS Cache from your browser (Google Chrome) you can do so by entering the following command into the address bar: chrome://net-internals/#dns

Cleaning your DNS cache is a simple process if you know the operating system and its version that you are using. You can choose to either to do the cleaning yourself or seek the help of your hosting company. When you buy hosting check what kind of support and help the hosting service provider is offering.