A caching BIND server obtains information from another server (a Zone Master) in response to a host query and then saves (caches) the data locally.
All you have to do is restart bind to clear its cache:
/etc/init.d/named restart
You can also use rndc command as follows to flush out all cache:
rndc restart
or
rndc exec
BIND v9.3.0 and above will support flushing all of the records attached to a particular domain name with rndc flushname command.
In this example flush all records related to sharewiz.net domain:
rndc flushname sharewiz.net
It is also possible to flush out BIND views. For example, lan and wan views can be flushed using the following command:
rndc flush lan rndc flush wan
dnsmasq is a lightweight DNS, TFTP and DHCP server.
It is intended to provide coupled DNS and DHCP service to a LAN.
Dnsmasq accepts DNS queries and either answers them from a small, local, cache or forwards them to a real, recursive, DNS server.
This software is also installed many cheap routers to cache DNS queries.
Just restart the dnsmasq service to flush out dns cache:
sudo /etc/init.d/dnsmasq restart
or
service dnsmasq restart
Nscd caches libc-issued requests to the Name Service. If retrieving NSS data is fairly expensive, nscd is able to speed up consecutive access to the same data dramatically and increase overall system performance. Just restart nscd:
sudo /etc/init.d/nscd restart
or
service nscd restart
or
service nscd reload
sudo dscacheutil -flushcache sudo killall -HUP mDNSResponder
sudo dscacheutil -flushcache
If you are using OS X 10.5 or earlier try the following command:
lookupd -flushcache
sudo systemd-resolve --flush-caches
ipconfig /flushdns