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IPCONFIG
Last updated: 1/16/04

Q. How do I check my network IP address in Windows XP (and in Windows 2000/NT)?

A. Open a DOS windows in Windows XP (Start, All Programs, Accessories, Command Prompt). Enter at the command prompt enter ipconfig, e.g...

C:\Documents and Settings\Larry F. Byard>ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.123.197
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.123.254

To obtain the syntax for ipconfig, enter ipconfig /?.

C:\Documents and Settings\Larry F. Byard>ipconfig /?

USAGE:
ipconfig [/? | /all | /renew [adapter] | /release [adapter] |
/flushdns | /displaydns | /registerdns |
/showclassid adapter |
/setclassid adapter [classid] ]

where
adapter Connection name
(wildcard characters * and ? allowed, see examples)

Options:
/? 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 Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names
/displaydns Display the contents of the DNS Resolver Cache.
/showclassid Displays all the dhcp class IDs allowed for adapter.
/setclassid Modifies the dhcp class id.

The default is to display only the IP address, subnet mask and
default gateway for each adapter bound to TCP/IP.

For Release and Renew, if no adapter name is specified, then the IP address
leases for all adapters bound to TCP/IP will be released or renewed.

For Setclassid, if no ClassId is specified, then the ClassId is removed.

Examples:
> ipconfig ... Show information.
> ipconfig /all ... Show detailed information
> ipconfig /renew ... renew all adapters
> ipconfig /renew EL* ... renew any connection that has its

name starting with EL
> ipconfig /release *Con* ... release all matching connections, eg. "Local Area Connection 1" or
"Local Area Connection 2"

If your PC is connected to the a device such as broadband router or cable MODEM with a DHCP server, you are using automatic IP addresses, and you want to test it, config /release and ipconfig /renew to release and renew the IP address lease. You should see it change, however, the new IP address may be the same as the old one. Larry

Copyright, Disclaimer, and Trademark Information Copyright © 1996-2006 Larry F. Byard.  All rights reserved. This material or parts thereof may not be copied, published, put on the Internet, rewritten, or redistributed without explicit, written permission from the author.