What’s APIPA?


A Windows-based computer that is configured to use DHCP can automatically assign itself an Internet Protocol (IP) address if a DHCP server is not available. For example, this could occur on a network without a DHCP server, or on a network if a DHCP server is temporarily down for maintenance.
With this feature, a Windows computer can assign itself an Internet Protocol (IP) address in the event that a DHCP server is not available or does not exist on the network. This feature makes configuring and supporting a small Local Area Network (LAN) running TCP/IP less difficult.

Is my computer using APIPA now?

Windows 98/ME

You can also determine whether your computer is using APIPA by using the Winipcfg tool in Windows Millennium Edition, Windows 98, or Windows 98 Second Edition:

Click Start, click Run, type “winipcfg” (without the quotation marks), and then click OK. Click More Info. If the IP Autoconfiguration Address box contains an IP address within the 169.254.x.x range, Automatic Private IP Addressing is enabled. If the IP Address box exists, automatic private IP addressing is not currently enabled.

Windows 2000/XP/2003

For Windows 2000, Windows XP, or Windows Server 2003, you can determine whether your computer is using APIPA by using the IPconfig command at a command prompt:

Click Start, click Run, type “cmd” (without the quotation marks), and then click OK to open a MS-DOS command line window. Type “ipconfig /all” (without the quotation marks), and then hit the ENTER key. If the ‘Autoconfiguration Enabled’ line says “Yes”, and the ‘Autoconfiguration IP Address’ is 169.254.x.y (where x.y is the client’s unique identifier), then the computer is using APIPA. If the ‘Autoconfiguration Enabled’ line says “No”, then the computer is not currently using APIPA.

 

Thanks to Petri

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