ipconfig
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. ...