You are in the: Small Business Computing Channelarrow View Sites +
Small Business Technology
» ECommerce-Guide | Small Business Computing | Webopedia | WinPlanet |  »Close
Enter a word for a definition... ...or choose a computer category.

   Term of the Day
   New Terms
   New Links
   Quick Reference
   Did You Know?
   Tech Support
   Webopedia Jobs
   About Us
   Link to Us

talk to us
   Submit a URL
   Suggest a Term
   Report an Error
Internet Lists
Internet News
Internet Resources
Linux/Open Source
Personal Technology
Small Business
Windows Technology
xSP Resources
Corporate Info
Tech Jobs
E-mail Offers
  Be a Commerce Partner

Last modified: Thursday, September 18, 2003 

Short for Automatic Private IP Addressing, a feature of later Windows operating systems. With APIPA, DHCP clients can automatically self-configure an IP address and subnet mask when a DHCP server isn't available. When a DHCP client boots up, it first looks for a DHCP server in order to obtain an IP address and subnet mask. If the client is unable to find the information, it uses APIPA to automatically configure itself with an IP address from a range that has been reserved especially for Microsoft. The IP address range is through The client also configures itself with a default class B subnet mask of A client uses the self-configured IP address until a DHCP server becomes available.

The APIPA service also checks regularly for the presence of a DHCP server (every five minutes, according to Microsoft). If it detects a DHCP server on the network, APIPA stops, and the DHCP server replaces the APIPA networking addresses with dynamically assigned addresses.

APIPA is meant for nonrouted small business environments, usually less than 25 clients.

E-mail this definition to a colleague

For pages about APIPA . Also check out the following links!

Related Links

Recursion Programming Tutorial 
A step-by-step introduction to programming in Recursion.

APIPA in Windows Millennium Edition
This article provides a description of the Automatic Private IP Addressing feature in Windows Millennium Edition (Me).

APIPA Tutorial
This Knowledge Labs tutorial walks the user through the APIPA set up.

Automatic Private IP Addressing
Information from Microsoft on APIPA, resolving IP conflicts in APIPA and disabling APIPA.

related categories


Business Computing

Internet Protocols

related terms


IP address

subnet mask

Give Us Your

ApPA Products
Compare Products,Prices and Stores

Shop by Category:
1 Model Matches

Books Miscellaneous
1 Store Offers

4 Store Offers

JupiterWeb networks:

Search JupiterWeb:

Jupitermedia Corporation has two divisions:
Jupiterimages andJupiterWeb

Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.

Jupitermedia Corporate Info | Newsletters | Tech Jobs | Shopping | E-mail Offers