Webmaster Resources | Networking Tutorials | How To Flush DNS Cache

When you change your domain dns or change website ip, you might have problem like cannot access website or viewing website on old ip. This is because website ip is cached at dns resolver. There are 2 levels of dns cache, at your computer and your ISP dns resolver cache.

Please see below how to clear / flush dns cache on your computer.

Windows OS
Please open a command prompt window and type command ipconfig /flushdns

With Mac OS X <= 10.4
macvin:~ root# lookupd -flushcache

With Mac OS X > 10.5
macvin:~ root# dscacheutil -flushcache

Some ISPs also cache domain dns, so you may need to wait 12-24 for dns cache refresh to complete a domain dns update.