View source for Ipconfig

{{Short description|Console application program}}
{{lowercase title|ipconfig}}
{{Infobox software
| name                   = ipconfig
| logo                   = 
| screenshot             = Ipconfig win xp.png
| screenshot size        = 
| caption                = Screenshot of <code>ipconfig /all</code> output in [[Windows XP]]
| developer              = [[Microsoft]], ReactOS Contributors, [[Apple Inc.]]
| released               = 
| latest release version = 
| latest release date    = 
| programming language   = [[C (programming language)|C]]
| operating system       = [[Microsoft Windows|Windows]], [[ReactOS]], [[macOS]]
| platform               = [[Cross-platform]]
| genre                  = [[Command (computing)|Command]]
| license                = Windows, macOS: [[Proprietary software|Proprietary]] [[commercial software]]<br />
ReactOS: [[GNU General Public License|GPL-2.0-or-later]]
| website                = 
}}{{Not to be confused with|ifconfig}}
'''<code>ipconfig</code>''' (standing for "[[Internet Protocol]] configuration") is a [[console application]] program of some computer [[operating system]]s that displays all current [[TCP/IP]] network configuration values and refreshes [[Dynamic Host Configuration Protocol]] (DHCP) and Domain Name System (DNS) settings.<ref>{{cite web |url= https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ipconfig |title=ipconfig |date=16 October 2017 |work=Microsoft Docs |access-date=25 August 2020}}</ref>

==Implementations==
The [[command (computing)|command]] is available in [[Microsoft Windows]], [[ReactOS]], and in [[Apple Inc.|Apple]] [[macOS]]. The ReactOS version was developed by Ged Murphy and is licensed under the [[GNU General Public License|GPL]].<ref>{{Cite web|url=https://github.com/reactos/reactos/blob/master/base/applications/network/ipconfig/ipconfig.c|title = Reactos/Ipconfig.c at master · reactos/Reactos|website = [[GitHub]]}}</ref>

===Microsoft Windows, ReactOS===
The <code>ipconfig</code> command supports the [[Command-line interface#Command-line option|command-line switch]] <code>/all</code>. This results in more detailed information than <code>ipconfig</code> alone.

An important additional feature of <code>ipconfig</code> is to force refreshing of the DHCP IP address of the host computer to request a different IP address. This is done using two commands in sequence. First, <code>ipconfig /release</code> is executed to force the client to immediately give up its lease by sending the server a DHCP release notification which updates the server's status information and marks the old client's IP address as "available". Then, the command <code>ipconfig /renew</code> is executed to request a new IP address.<ref>[http://www.wikihow.com/Refresh-Your-IP-Address-on-a-Windows-Computer Release and Renew Your IP Address]</ref><ref>[https://kb.wisc.edu/page.php?id=562 Windows – Displaying, Releasing and Renewing a DHCP Lease]</ref> Where a computer is connected to a cable or DSL modem, it may have to be plugged directly into the modem network port to bypass the router, before using <code>ipconfig /release</code> and turning off the power for a period of time, to ensure that the old IP address is taken by another computer.<ref>[https://www.peekmyip.com/p/how-to-change-your-ip-address-on-any.html PeekMyIP: How to change your IP address]</ref>

The <code>/flushdns</code> parameter can be used to clear the Domain Name System (DNS)<ref>{{Citation |title=Domain Name System (DNS) |work=Understanding IPv6 |pages=151–172 |url=http://dx.doi.org/10.1007/0-387-25614-8_9 |access-date=2024-03-06 |place=New York |publisher=Springer-Verlag |isbn=0-387-25429-3}}</ref> cache to ensure future requests use fresh DNS information by forcing hostnames to be resolved again from scratch.<ref>[http://blog.fmsinc.com/windows-8-1-pcs-connect-to-the-network-but-not-the-internet/ Windows 8.1 PCs Connect to the Network but not the Internet]</ref>)

===Apple macOS===
<code>ipconfig</code> in [[Mac OS X]] serves as a wrapper to the IPConfiguration agent, and can be used to control the [[Bootstrap Protocol]] and DHCP client from the command-line interface.<ref>[https://developer.apple.com/documentation/Darwin/Reference/ManPages/man8/ipconfig.8.html OS X developer manual]</ref> For example, you can release and renew an IP address if it happened to be assigned incorrectly by the DHCP server during the automated assignment process.<ref>{{Cite web |title=Ipconfig – network administration via the command line |url=https://www.ionos.ca/digitalguide/server/configuration/ipconfig/ |access-date=2022-08-23 |website=IONOS Digitalguide |language=en}}</ref> Like most [[Unix]]-based operating systems, Mac OS X also uses <code>[[ifconfig]]</code> for more direct control over network interfaces, such as configuring static IP addresses.  The Ifconfig command in Linux has been replaced by the IP command

==See also ==
*[[ifconfig]]

==References==
{{Reflist}}

==Further reading==
*{{Cite book|first=Æleen|last=Frisch|year=2001|title=Windows 2000 Commands Pocket Reference|publisher=[[O'Reilly Media|O'Reilly]]|isbn=978-0-596-00148-3}}
*{{Cite book |first=William R. |last=Stanek |year=2008 |title=Windows Command-Line Administrator's Pocket Consultant, 2nd Edition |publisher=[[Microsoft Press]] |isbn=978-0735622623}}
*{{Cite book|first=Daniel J.|last=Barrett|year=2012|title= Off Macintosh Terminal Pocket Guide: Take Command of Your Mac|publisher=[[O'Reilly Media|O'Reilly]]|isbn=}}

==External links==
{{Wikibooks|Guide to Windows Commands}}
*Windows
**[https://technet.microsoft.com/en-us/library/bb490921.aspx Microsoft TechNet Ipconfig article]
**[http://variableghz.com/2008/09/getting-serious-about-vnc/ VariableGHz article detailing ipconfig settings in Vista] {{Webarchive|url=https://web.archive.org/web/20220902072102/https://variableghz.com/2008/09/getting-serious-about-vnc/ |date=2022-09-02 }}
**[http://www.computerhope.com/ipconfig.htm Windows 95, 98, ME; Windows 2000 and XP MS-DOS shell syntax]
**[https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ipconfig ipconfig] documentation for [[Microsoft Windows|Windows]]
*Mac OS X
**{{man|8|ipconfig|Darwin|view and control IP configuration state}}

{{Windows commands}}

[[Category:Windows communication and services]]
[[Category:Windows administration]]
[[Category:MacOS-only software made by Apple Inc.]]