How to Flush DNS Cache in macOS Catalina & Big Surīefore you go ahead with the following procedure, make sure that your Mac is running macOS Catalina or later, as clearing DNS cache on older versions of macOS varies slightly. Flushing the DNS cache on your Mac removes all the invalid entries and forces the system to recollect those addresses the next time you visit the website. However, if this IP address changes prior to the entry in your DNS cache updates, you won’t be able to access the site without resetting your DNS cache. ![]() Your Mac stores the IP addresses of web servers that contain pages that you’ve recently visited. But if you’re only facing connectivity issues on that particular website, then it could be a DNS error, and this is an example when clearing out DNS cache can be helpful. If you’re unable to access a website that you visited recently, then of course the first thing you’d check is whether you have a working internet connection.
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