Disabling Automatic Private IP Addressing (APIPA) on Windows XP Professional Systems

By Dan DiNicolo, May 17th, 2007 Posted in Windows XP. Subscribe to our RSS Feed

Automatic Private IP Addressing (APIPA) is a Windows feature that assigns a DHCP-enabled network connection an IP address in the range 169.254.x.y in cases where a DHCP server is not available to allocate a legitimate IP address. Designed as a stopgap measure in case the DHCP server is only temporarily off line, a system with an APIPA address will attempt to contact the DHCP server to obtain a valid address at regular intervals.

While APIPA has its uses, some administrators would rather it not exist at all. The good news is that disabling APIPA for a given network adapter is easy enough via a Registry edit. Just follow these steps for a Windows XP Professional system:

1. Click Start > Run. Type Regedit.exe and press OK.

2. Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\Adapters

3. Double click on the IPAutoconfigurationEnabled entry, and change its Value data to 0.

4. Close Regedit and restart.

Written by Dan DiNicolo - Visit Website

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