Reservation Strategies for the Zeroth and Last Code Points in IETF Registries and for Bit Field Registries

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Last updated 2016-03-21 (latest revision 2015-09-18)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes common code point reservation strategies for the zeroth and last code points in IANA-managed IETF registries and for bit-field registries. This document additionally provides the reasoning to support these strategies and their adoption as Best Current Practices to be applied to all IETF registries.


Jeffrey Haas (

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