What is the full form of APIPA

APIPA: Automatic Private Internet Protocol Addressing

APIPA is an acronym stands for Automatic Private Internet Protocol Addressing. It is a specific feature of operating system (especially Windows based operating system such as Windows 98, Windows 2000, and Windows XP) that facilitates a personal computer to assign an IP address by itself when the DHCP (Dynamic Host Configuration Protocol) is not available.

How it works

APIPA serves as a backup operational mode for DHCP server and makes it capable to manage small Local Area Network. It assigns a unique number called Internet Protocol (IP) to each user or device to connect to a network.

Usage of APIPA

  • With APIPA, an IP address and subnet mask can be automatically self configured.
  • APIPA is generally used for non-routed small business environment, usually less than 25 clients.
  • APIPA facilitates client to configure itself with a default class B subnet mask of
  • APIPA service checks regularly for the presence of DHCP server. If it finds a DHCP server on the network, it stops, and the DHCP server replaces the APIPA networking addresses with dynamically assigned addresses.