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How do I clear the DNS cache on the computer?

We all use the Domain Name System (DNS) to access websites. This system allows you to use URLs instead of numeric IP addresses. This makes it much easier for potential customers to remember and find your website. Sometimes the DNS cache needs to be cleared.

Our computer must access a DNS server to "translate" the URL into an IP address. This process may be slower the first time you access a website, while subsequent searches on the same website may be faster. This is because your operating system creates its own cache for the address of a website when you first access it.

A DNS cache stores information in its resource records. These records are useful for speeding up search results, but can cause problems afterwards. In some cases, clearing the browser cache is not enough. You must also clear the DNS cache.

Instructions for clearing the DNS cache

The DNS cache stores your requests locally. Therefore, your information may become outdated when the settings of a website are changed. To fix the problem, you can clear the DNS cache in your operating system. To clear the DNS cache, follow the steps described below.

For Windows operating systems

1. click: Start, Run, then type: "cmd" and press Enter.
2. when the command prompt opens, type the following: "ipconfig /flushdns" and then press the Enter key
Your DNS cache is now completely cleared
dns-cache
Windows example

For Mac OS X operating systems

Open a terminal window by clicking Applications, Utilities, and then Terminal.
At the command prompt, type one of the following commands, depending on the version:

For OS X Yosemite v10.10.4 or higher enter the following

sudo killall -HUP mDNSResponder

For OS X Yosemite v10.10 to v10.10.3 enter the following

sudo discoveryutil mdnsflushcache

For OS X Mavericks, Mountain Lion and Lion enter the following

sudo killall -HUP mDNSResponder

For Mac OS X Snow Leopard enter the following

sudo dscacheutil -flushcache
dns-cache
Example Mac

Google Chrome browser

1.open Google Chrome
2.type the following in the address bar: chrome://net-internals/#dns
3.Click: Clear Host Cache
4.click on your URL bar and type the following: chrome://net-internals/#sockets
5.Click on: Close idle sockets and finally on: Empty socket pools.

Firefox browser

1.open Firefox
2.type the following in the address bar: about:networking#dns
3.click on: Clear DNS cache

Why clear the DNS cache?

There are several reasons why it is important to clear your DNS cache regularly:

Your cache may contain outdated information that prevents you from getting the right information or accessing websites or applications.

You have DNS changes and must ensure that the DNS has been updated.

There is a possibility for cyber criminals to access your information by modifying the cache, which is called "DNS poisoning" or "DNS spoofing". Therefore, for your own safety, it is best to clear your information regularly.

Clearing the cache is a good way to force DNS updates to show changes to your site faster, or if you have customized DNS records.

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