How To Clear DNS On Mac?

Table of Contents

How to Effectively Clear DNS Cache on Your Mac

How to clear DNS on Mac? Clearing your DNS cache on a Mac involves using Terminal commands, and this action helps resolve issues such as website loading errors and ensures you’re accessing the most up-to-date website information.

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Understanding the Importance of Flushing Your DNS

The Domain Name System (DNS) acts as the internet’s phone book, translating human-readable domain names (like google.com) into IP addresses that computers use to locate web servers. Your Mac stores these translations in a local DNS cache to speed up future browsing. However, this cache can become outdated or corrupted, leading to various network issues. That’s where knowing how to clear DNS on Mac becomes incredibly useful.

Why You Might Need to Clear Your DNS Cache

Several reasons might necessitate flushing your DNS cache:

Website Loading Errors: If you’re experiencing issues accessing specific websites, even though your internet connection is stable, a corrupted DNS entry could be the culprit.
“Website Not Found” Errors: Similar to the above, outdated DNS information can prevent your browser from finding the correct server.
Redirect Issues: If a website has recently moved to a new server, your old DNS cache may be directing you to the wrong location.
Security Concerns: In some cases, malicious actors can poison DNS caches, redirecting users to fake websites. Clearing your DNS cache can help mitigate this risk.
Troubleshooting Network Problems: Clearing the DNS cache is a common troubleshooting step when diagnosing network connectivity problems.

The Process: Clearing DNS on Your Mac

The method for clearing the DNS cache on a Mac depends on the macOS version you’re running. Older versions of macOS use different commands than newer versions. Here’s a breakdown:

Determine Your macOS Version: Click the Apple menu () in the top-left corner of your screen and select “About This Mac.” Note the version number listed.
Open Terminal: Open Finder, go to “Applications,” then “Utilities,” and double-click “Terminal.”
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Enter the Appropriate Command: Based on your macOS version, enter one of the following commands and press Enter. You will likely be prompted for your administrator password.
- macOS Sierra (10.12), macOS High Sierra (10.13), macOS Mojave (10.14):
```
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
```
- macOS Catalina (10.15) and macOS Big Sur (11):
```
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
```
- macOS Monterey (12) and macOS Ventura (13) and macOS Sonoma (14):
```
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
```
- Older Versions of macOS (Prior to Sierra):
```
sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder
```
Enter Your Password (If Prompted): You’ll be asked for your administrator password. Type it in and press Enter. Note that you won’t see any characters appearing as you type.
Confirmation: After entering the command and your password (if required), the DNS cache is cleared. In most cases, you won’t see any explicit confirmation message.

Alternative Method: Using `mDNSResponder`

In some cases, the dscacheutil command might not be sufficient. You can try using the mDNSResponder command directly. Open Terminal and run:

sudo killall -HUP mDNSResponder

This command restarts the mDNSResponder process, which is responsible for resolving DNS queries. It can be particularly effective for addressing issues related to local network name resolution.

Common Mistakes to Avoid

Using the Wrong Command: Ensure you’re using the correct command for your macOS version. Using the wrong command might not clear the DNS cache effectively.
Typing the Command Incorrectly: Terminal commands are case-sensitive. Double-check that you’ve typed the command correctly, including spaces and punctuation.
Forgetting sudo: The sudo command is necessary to execute the command with administrator privileges. Without it, the command won’t have the necessary permissions to clear the DNS cache.
Not Restarting Your Browser: After clearing the DNS cache, close and reopen your web browser. This ensures that the browser uses the newly cleared DNS information.
Assuming it Will Fix Everything: Clearing the DNS cache is just one troubleshooting step. If the problem persists, there may be other underlying network issues.

Verifying That The DNS Cache Is Cleared

While there’s no definitive way to confirm the DNS cache is empty, you can check by attempting to access a website you were previously having trouble with. If it now loads correctly, it’s likely that clearing the DNS cache resolved the issue. Also, you can use DNS lookup tools available online to check if the IP address associated with a domain has been updated after a known DNS change.

Frequently Asked Questions (FAQs)

Will clearing my DNS cache delete my browser history?

No, clearing your DNS cache will not delete your browser history, cookies, or any other browsing data. It only clears the local DNS cache, which is a separate component responsible for translating domain names into IP addresses.

How often should I clear my DNS cache on my Mac?

You typically only need to clear your DNS cache when you’re experiencing network-related issues or suspect that the cache is outdated. There’s no need to clear it on a regular basis. However, clearing it periodically as part of routine maintenance won’t cause harm.

Is it safe to clear my DNS cache?

Yes, it is generally safe to clear your DNS cache. It won’t harm your computer or your data. It simply forces your computer to retrieve the latest DNS information from the DNS servers.

What if clearing the DNS cache doesn’t fix my problem?

If clearing the DNS cache doesn’t resolve your issue, there may be other network-related problems. Try restarting your router and modem, checking your internet connection, or contacting your internet service provider. Other issues could include incorrect network settings, problems with the website itself, or firewall restrictions.

Can I clear the DNS cache from my web browser?

Web browsers have their own separate caches, but these are for website content like images and CSS, not DNS information. Clearing browser history and cache can help with some website issues, but it’s different from clearing the system-level DNS cache.

Does clearing the DNS cache improve my internet speed?

Clearing the DNS cache might slightly improve internet speed if you were previously using outdated DNS information. However, the impact is usually minimal. If you’re experiencing consistently slow internet speeds, there are likely other factors at play, such as your internet plan, router performance, or network congestion.

What is a DNS server?

A DNS server is a server that translates domain names (like example.com) into IP addresses (like 192.0.2.1). These servers are crucial for internet navigation, allowing users to access websites using easy-to-remember names rather than complex numeric addresses.

How do I change my DNS server on a Mac?

You can change your DNS server in System Preferences. Go to System Preferences -> Network -> Select your active network connection (e.g., Wi-Fi) -> Advanced -> DNS. Here, you can add or remove DNS server addresses. Popular public DNS servers include Google DNS (8.8.8.8 and 8.8.4.4) and Cloudflare DNS (1.1.1.1 and 1.0.0.1). Changing your DNS server can sometimes improve browsing speed and security.

What is the difference between DNS cache and browser cache?

The DNS cache stores IP addresses associated with domain names to speed up website access, while the browser cache stores website content (images, CSS, etc.) to reduce loading times for frequently visited pages. They serve different purposes in optimizing your browsing experience.

What happens if I use the wrong command to clear the DNS cache?

Using the wrong command might not clear the DNS cache effectively. In some cases, it might produce an error message. However, it’s unlikely to cause any significant harm to your computer. Simply use the correct command for your macOS version to clear the cache properly.

Can malware affect my DNS cache?

Yes, malware can potentially affect your DNS cache by redirecting you to malicious websites. This is known as DNS poisoning. Clearing your DNS cache can help mitigate this risk, but it’s also important to have robust security software to protect your computer from malware.

Does clearing the DNS cache affect other devices on my network?

No, clearing the DNS cache on your Mac only affects that specific device. Other devices on your network will have their own separate DNS caches. If you’re experiencing network-wide issues, you may need to troubleshoot your router or modem.