Wntipcfg.exe: Windows NT IPConfig Utility
This GUI tool gives you information about your IP configuration.
Do you support both Windows 9x and Windows XP on your network? If so,
you know that each OS offers a utility that quickly retrieves diagnostic
information about your system's TCP/IP network configuration.

Win9x offers a GUI IP configuration utility called Winipcfg, from which
you can perform a number of IP-related operations. However, XP's IPConfig
utility is a command-line tool, so you have to type a separate command
for each IP operation that you want to perform.

XP also ships with a GUI status display that allows you to view and
repair TCP/IP connectivity. This is located in the Support tab of the Local
Area Connection dialog box.

If you're looking for a separate GUI-based IP configuration utility for
XP, check out Wntipcfg.exe. This utility, originally created for the
Windows NT 4 Resource Kit and also packaged in the Windows 2000 Resource Kit,
works just fine in XP. Wntipcfg.exe is sufficient in most circumstances,
but you may still need to use IPConfig for intricate troubleshooting
operations.

(From Windows XP Tips at TechRepublic.com Thu, Mar 27th, 2003)
http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/wntipcfg-o.asp