Used specifically for diagnosing IP and Networking issues on Windows systems.

• ipconfig /all - Shows detailed list of current IP config.
• ipconfig /release - Clears current IP config. Use when troubleshooting DHCP issues or if an APIPA address was issued
• ipconfig /renew - Renews the IP and config from the DHCP server.
• ipconfig /flushdns - Removes all DNS resolver cache entries
• ipconfig /registerdns - Refreshes all DHCP leases and reregisters DNS names.
• ipconfig /displaydns - Displays contents of the DNS Resolver Cache.