Options for Ipconfig.exe in Windows 2000

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This article was previously published under Q223413

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SUMMARY

Ipconfig.exe is a command-line tool you can use to renew and release leases obtained from a Dynamic Host Configuration Protocol (DHCP) server, and display your IP settings. This article describes these and other Ipconfig features.

MORE INFORMATION

The syntax for Ipconfig.exe is:

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Parameter	Description
/?	Display this help message
/all	Display full configuration information
/release	Release the IP address for the specified adapter
/renew	Renew the IP address for the specified adapter
/flushdns	Purge the DNS resolver cache
/registerdns	Refresh all DHCP leases and re-register DNS names
/displaydns	Display the contents of the DNS resolver cache

The first four switches are the same as those in Microsoft Windows NT 4.0 and earlier version. For additional information about these switches, click the article number below to view the article in the Microsoft Knowledge Base:

117662 (http://support.microsoft.com/kb/117662/EN-US/ ) IPCONFIG Diagnostic Utility: Parameters and Usage

The /flushdns switch flushes the list of locally cached DNS names. When a name is resolved from DNS, the client keeps it in the cache temporarily. This option removes the cached entries.
The /registerdns switch allows the client to re-register its dynamic DNS entries as well as renew the DHCP lease.
The /displaydns switch lists the contents of your resolved DNS name cache.