An Interoperable Subset of Characters for Internationalized Usernames

Document Type Expired Internet-Draft (individual)
Last updated 2014-10-03 (latest revision 2014-04-01)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Various Internet protocols define constructs for usernames, i.e., the localpart of an address such as "". This document describes a subset of Unicode characters to allow in internationalized usernames for the sake of maximal interoperability across Internet protocols.


Peter Saint-Andre (

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