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Clear DNS info

To clear cached DNS info in various versions of Mac OS X...

Mac OS X Yosemite and later: sudo killall -HUP mDNSResponder
Mac OS X Yosemite v10.10 through v10.10.3: sudo discoveryutil mdnsflushcache
Mac OS X Mavericks, Mountain Lion and Lion: sudo killall -HUP mDNSResponder
Mac OS X Snow Leopard: sudo dscacheutil -flushcache




My latest blog post: Think for Yourself: In the end, everything is just an opinion. Be skeptical, and think for yourself! (posted 2026-04-25).

My latest podcast: OJB's Podcast 2026-04-14 How Far is that Star?

If you're not sure what to view from my site, here are some suggestions: My Latest Airshow Report, My Favourite Wines and Beers, An Interesting Astronomical Observation, See Some Photos, Read Some Mac Tips.

Site News (Mobile): OJB's web site, v 2.4 which has major changes, and possibly errors! Please report anything to ojb@mac.com.