Provider Independent vs Provider Aggregatable Address Space

Document Type Expired Internet-Draft (individual)
Author Daniel Karrenberg 
Last updated 1995-10-02
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


One can currently distinguish two kinds of globally unique, unicast IPv4 addresses: provider independent (PI) and provider aggregatable (PA) addresses. These addresses are assigned to end-users by Internet Registries (IRs). There are also non globally unique e.g. private unicast addresses as described in RFC1597 which are suitable for many applications.


Daniel Karrenberg (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)