RFC 1219 · INFORMATIONAL · 1991
SUN · 14 JUN 2026
On the assignment of subnet numbers
Overview
RFC 1219, “On the assignment of subnet numbers”, is an Informational document published in April 1991 by P.F. Tsuchiya. The canonical text is published by the RFC Editor.
Abstract
This memo suggests a new procedure for assigning subnet numbers. Use of this assignment technique within a network would be a purely local matter, and would not effect other networks. This memo provides information for the Internet community. It does not specify an Internet standard.
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 1219 is hosted at rfc-editor.org. Available in TXT,HTML.
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