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How do I flush my DNS on macOS
To flush your DNS in macOS fix open Terminal then type one of the following depending on which version of macOS / OS X you are using :
El Capitan, Sierra (OS X 10.11, macOS 10.12)
sudo killall -HUP mDNSResponder
Yosemite (OS X 10.10)
10.10.4+
sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder
10.10.1-3
sudo discoveryutil udnsflushcaches
Mavericks (OS X 10.9)
dscacheutil -flushcache; sudo killall -HUP mDNSResponder
Lion, Mountain Lion (OS X 10.7, 10.8)
sudo killall -HUP mDNSResponder
Leopard, Snow Leopard (Mac OS X 10.5, 10.6)
dscacheutil -flushcache
Tiger (Mac OS X 10.4)
lookupd -flushcache