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On Mac How to Clear DNS Cache

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  • On Mac How to Clear DNS Cache

Posted By: Wouter | 1 Replies | Last Reply On: May 23, 2017 00:54:33

How to clear DNS cache on a Mac?

Psychz - Girish

Votes: 0Posted On: May 23, 2017 00:54:33
 

Generally, when the URLs stop resolving the way they should, it is time to clear or flush the DNS nameserver local cache.

How to Clear DNS Caches in Mac OS X Yosemite or El Capitan?

To reset the DNS cache in Mac OS you need to find the Terminal app

 /Applications/Utilities/

You need to clear both UDNS (Unicast DNS) and MDNS (Multicast DNS) with two different commands to fully reset the DNS caches in the most recent version of OS X.

Command to clear MDNS Cache

sudo discoveryutil mdnsflushcache


Command to clear UDNS Cache


sudo discoveryutil udnsflushcaches (Here the command has caches as plural, a small syntax variation)

 

Clearing DNS cache in other versions of Mac OS
 

Version: X Mavericks, Mountain Lion, and Lion (OS X v10.9.5 and earlier)


sudo killall -HUP mDNSResponder


 Version: Mac OS X Snow Leopard (OS X v10.6 upto v10.6.8)


sudo dscacheutil -flushcache

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