RFC 6912

Principles for Unicode Code Point Inclusion in Labels in the DNS, April 2013

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A. Sullivan
D. Thaler
J. Klensin
O. Kolkman

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DOI:  http://dx.doi.org/10.17487/RFC6912

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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.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.

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