What is DNS Cache

 

Introduction:

 

A DNS cache is nothing but which stores the location of IP address which you have recently opened. 

DNS cache refers to the temporary storage of information about the previous DNS lookup which is stored on a machine's OS or in a web browser. And today, if you are storing a local copy of DNS lookups, will allow your OS or browser to retrieve it quickly and thus a website's URL can be resolved to its corresponding IP much more efficiently. The basic function of different cache types is all more or less the same.  

 

What is the purpose of using DNS Cache?

 

As you know that today internet relies on the Domain Name System (DNS) to maintain an index of all websites and their corresponding IP addresses. DNS caching does not only occur at the OS and browser level. Because in DNS lookup it involves various steps. So if you are looking for a  new DNS lookup then that lookup has to passes through the resolver, root server, and TLD server. And at each step all the information are collected and cached for later use. Hence even if your local DNS cache is empty your resolver may have copied cache of the required information and thus avoiding the need to go through the complete DNS lookup process.

 

How to Check your DNS Cache?

 

One simple method is that- you can check your operating system's logo to see which DNS records are cached locally. And the process to check this will vary depending upon which operating system you use. Below is the information on how to check your DNS cache via operating system;

 

Window - If you are using Windows OS then you can easily view your DNS cache entries.  All you need to do is just open your command prompt and enter this command- ipconfig /displaydns.

 

Mac - And if you are a Mac user then viewing your DNS cache entries is bit different. To check you first need to open the Console app and then there you need to select your device from the left sidebar and then enter : any:mdnsresponder into the search bar.

Next you need to open your command line and in here you need to enter this command - sudo killall -INFO mDNSResponder. Now you will be able to go back to your console app and over there you can see the list of cached DNS records.

 

In addition to that, you can also check your DNS cache entries on certain browsers. For example, if you’re using Chrome, then you can type: chrome://net-internals/#dns into your address bar which will return your browser’s current list of cached DNS records.

 

Before the entry in your DNS cache updates if the location of the website hosting server change you will no longer able to open or view your website.

 

What is the issue we face from DNS cache

 

Basically, due to the DNS cache problem, you will see a large number of HTML error 404 codes, For these, you need to clear the DNS cache. When you clear the Domain Name Server cache your computer will clear the previous DNS which was stored.

 

Troubleshooting

 

The troubleshooting steps will depend on the OS which you are running on your computer as mentioned below.

 

Windows® 8

 

To clear the DNS cache on windows 8 OS follow the below steps:

 

1. On your keyboard press win+x to open the WinX menu.

 

2. Right-click Command Prompt and select Run as Administrator.

 

3. Then you need to run the below commands.

 

ipconfig /flushdns

 

If the above command gets succeeds your system will display the below message.

 

Windows IP configuration successfully flushed the DNS Resolver Cache.

 

Windows® 7

 

To clear the DNS cache on windows 7 Os follow the below steps:

 

1. Click on the START button.

 

2. In the search box type cmd to get the command prompt.

 

3. Right-click Command Prompt and select Run as Administrator.

 

4. And then run the below command.

 

ipconfig /flushdns

 

If it gets succeeds you will get the below successful message on your system.

 

Windows IP configuration successfully flushed the DNS Resolver Cache.

 

Windows XP®, 2000, or Vista®

 

To clear the DNS cache on the old versions of Windows OS like XP, Vista etc.. you need to follow the below steps.

 

1. Click on the START button.

 

2. Click Run on the on the start menu.

If you do not see the Run command in Vista, enter run in the Search bar.

 

3. Then run the below command.

 

ipconfig /flushdns

 

After it succeeds your system will display the following message.

 

Successfully flushed the DNS Resolver Cache.

 

Mac OS

 

To clear the DNS cache on the Mac OS you need to follow the different steps which depend on the version of OS.

 

MacOS® 10.10.4 and above

 

To clear your DNS cache if you use MacOS X version 10.10.4 or above, Follow the below steps:

 

  • Click on Applications

  • Click Utilities

  • Then click on terminal

  • Run the following command:

 

sudo killall -HUP mDNSResponder

 

If the above command did its job you will not get any alert or successful message.

 

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, follow the below steps:

 

  • Click on Applications

 

  • Click Utilities

 

  • Then click on terminal

 

  • Run the following command:

  • sudo discoveryutil mdnsflushcache

 

If the above command did its job you will not get any alert or successful message.

 

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, follow the below steps:

 

  • Click on Applications

 

  • Click Utilities

 

  • Then click on terminal

 

  • Run the following command:

 

  • sudo killall -HUP mDNSResponder

 

If the above command did its job you will not get any alert or successful message.

 

MacOS 10.5 and 10.6

 

To clear your DNS cache if you use MacOS X version 10.5 or 10.6, follow the below steps:

 

  • Click on Applications

 

  • Click Utilities

 

  • Then click on terminal

 

  • Run the following command:

 

  • sudo dscacheutil -flushcache

 

If the above command did its job you will not get any alert or successful message.


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