The Syntax and Options for Using the Ipconfig Diagnostic Utility for Network Connections

For a Microsoft Windows 2000 version of this article, see 117662 .


This article tells how to run the Ipconfig utility and lists the options that you can use.

Ipconfig.exe is included with Windows XP. This utility provides you with diagnostic information related to TCP/IP network configuration. Ipconfig also accepts various Dynamic Host Configuration Protocol (DHCP) commands, allowing a system to update or release its TCP/IP network configuration.

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To run the Ipconfig.exe utility, at a command prompt, type ipconfig, and then add any appropriate options.

ipconfig [/? | /all | /renew adapter | /release adapter | /flushdns | /displaydns | /registerdns | /showclassid adapter | /setclassid adapter classid
The adapter connection name can use wildcard characters (* and ?).


/? Displays this help message

/all Displays full configuration information

/release Releases the IP address for the specified adapter

/renew Renews the IP address for the specified adapter

/flushdns Purges the DNS Resolver cache

/registerdns Refreshes all DHCP leases and reregisters DNS names

/displaydns Displays the contents of the DNS Resolver Cache

/showclassid Displays all the DHCP ClassIds allowed for the specified adapter

/setclassid Modifies the DHCP ClassId
The default (with no parameters specified) is to display only the IP address, subnet mask, and default gateway for each adapter that is bound to TCP/IP.

For /all, Ipconfig displays all of the current TCP/IP configuration values, including the IP address, subnet mask, default gateway, and Windows Internet Naming Service (WINS) and DNS configuration.

For /release and /renew, if no adapter name is specified, the IP address leases for all adapters that are bound to TCP/IP are released or renewed.

For /setclassid, if no ClassId is specified, the ClassId is removed.


ipconfig Show information

ipconfig /all Show detailed information

ipconfig /renew Renew all adapters

ipconfig /renew EL* Renew any connection whose name starts EL

ipconfig /release *Con* Release all matching connections, for example, "Local Area Connection 1" or "Local Area Connection2"

Note that the /Release and /Renew options can be used only if the system is configured with DHCP.

Article ID: 314850 - Last Review: Oct 23, 2008 - Revision: 1