How to flush DNS Mac cache

This article explains how to clear your Mac's DNS cache to resolve website loading issues. It covers both using a utility (CleanMyMac X) and manual methods via Terminal, detailing commands for different macOS versions. Performance monitoring tools (iStat Menus) and backup solutions (Get Backup Pro) are also highlighted.

Understanding DNS Cache and Why Flushing is Necessary

DNS (Domain Name System) translates domain names (like example.com) into IP addresses computers understand. Your Mac caches these translations for faster website loading. However, outdated or incorrect cached entries can cause problems. This is where flushing the DNS cache comes in.

Troubleshooting DNS Cache Issues

The article provides solutions for various problems related to DNS cache clearing:

Problem	Solution
Junk and malware removal challenges	Use CleanMyMac X (Maintenance > Flush DNS Cache).
Unfamiliar DNS cache flushing (Big Sur and later)	Use Terminal: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder (requires password). Alternatively, use Core Shell.
Terminal command failures (Catalina and earlier)	Use Terminal: sudo killall -HUP mDNSResponder (requires password).
Flushing DNS cache not improving performance	Monitor system resources (RAM, CPU) with iStat Menus.

One-Click DNS Cache Clearing with CleanMyMac X

CleanMyMac X simplifies the process:

1. Open CleanMyMac X.
2. Navigate to the Maintenance tab.
3. Select "Flush DNS Cache."
4. Click "Run."

Manual DNS Cache Clearing (Terminal Commands)

The article provides manual instructions, differentiating between macOS versions:

• macOS Big Sur and later: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
• macOS Catalina and earlier: sudo killall -HUP mDNSResponder
• macOS Yosemite: sudo discoveryutil udnsflushcaches
• macOS Mavericks: sudo killall -HUP mDNSResponder

Remember to enter your password after typing the command. Core Shell is suggested as an alternative for advanced users.

Additional Tips for Mac Performance Optimization

The article recommends:

• iStat Menus: For real-time system monitoring.
• Get Backup Pro: For creating regular backups.

Both are available through Setapp.

Frequently Asked Questions (FAQ)

The article concludes with a FAQ section addressing common concerns about DNS cache location, safety, and verification of successful clearing.

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