Principles for Unicode Code Point Inclusion in Labels in the DNS
RFC 6912, “Principles for Unicode Code Point Inclusion in Labels in the DNS”, is an Informational document published in April 2013 by A. Sullivan, D. Thaler, J. Klensin, O. Kolkman. The canonical text is published by the RFC Editor.
Abstract
Internationalized Domain Names in Applications (IDNA) makes available to DNS zone administrators a very wide range of Unicode code points. Most operators of zones should probably not permit registration of U-labels using the entire range. This is especially true of zones that accept registrations across organizational boundaries, such as top-level domains and, most importantly, the root. It is unfortunately not possible to generate algorithms to determine whether permitting a code point presents a low risk. This memo presents a set of principles that can be used to guide the decision of whether a Unicode code point may be wisely included in the repertoire of permissible code points in a U-label in a zone.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 6912 is hosted at rfc-editor.org. Available in TXT,HTML.
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