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You’ve probably used the ipconfig
command to view TCP/IP settings and renew a DHCP lease. In addition to these
tasks, ipconfig can also help you manage DNS settings
on a computer.

For example, the DNS resolver
cache tracks the results of DNS name resolution queries so that subsequent
queries can be resolved from the cache for better performance. However, Windows
caches failed DNS lookups as well as successful ones. If a DNS lookup fails
because of a network problem (e.g., a DNS server is offline), you must clear
the cache to enable the resolution to work after the network problem is
resolved. To clear the resolver cache, use this command:

ipconfig /flushdns

On occasion, you might want to view the contents of the resolver cache. For example, you might want to determine
how long before a value expires or identify the IP address for a given host
name. Use this command to view the resolver cache:

ipconfig /displaydns

Finally, you can use ipconfig to
refresh all DHCP leases and re-register the host’s DNS names in its target DNS
server:

ipconfig /registerdns