RFC 2101 · INFORMATIONAL · 1997
SUN · 14 JUN 2026
IPv4 Address Behaviour Today
Overview
RFC 2101, “IPv4 Address Behaviour Today”, is an Informational document published in February 1997 by B. Carpenter, J. Crowcroft, Y. Rekhter. The canonical text is published by the RFC Editor.
Abstract
The main purpose of this note is to clarify the current interpretation of the 32-bit IP version 4 address space, whose significance has changed substantially since it was originally defined. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 2101 is hosted at rfc-editor.org. Available in TXT,HTML.
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