Flush DNS Cache on MAC OS X

Mac OS X — Clearing or flush­ing the DNS Cache

Once you go to a Web site, or do any DNS lookup, the IP gets cached for quite a while. This becomes a royal pain if you’re a sys­tems admin­is­trator who is in the middle of migrat­ing domains from one server to another. Executing the fol­low­ing clears the cache, restarts the cach­ing dae­mon, and fetches fresh DNS records. And there was much rejoicing…

For Leopard


sudo dscacheutil -flushcache


For Tiger

lookupd -flushcache

(On Windows you do ipconfig /flushdns)

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