XP Network Utilities-ipconfig.exe
To run the Ipconfig.exe utility, at a command prompt, type ipconfig, and then add any appropriate options.
SYNTAX
ipconfig [/? | /all | /renew adapter | /release adapter | /flushdns | /displaydns | /registerdns | /showclassid adapter | /setclassid adapter classid
The adapter connection name can use wildcard characters (* and ?).
OPTIONS
/? 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.
http://support.microsoft.com/kb/314850
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