From LedHed's Wiki
This article describes how to change the IP address of a Windows based computer from the commandline.
Contents
Changing Static IP to Obtain from DHCP
netsh interface ip set address "Local Area Connection" dhcp
Changing Static to Static
Checking Interfaces
netsh interface ip show config
Changing Static to Static
Usage:
net sh interface ip set address "Local Area Connection" static ipaddr netmask gatway metric
Example:
netsh interface ip set address "Local Area Connection" static 192.168.0.10 255.255.255.0 192.168.0.1 1
References
How to Use the NETSH Command to Change from Static IP Address to DHCP in Windows 2000 - http://support.microsoft.com/kb/257748