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Status:

INFORMATIONAL

Authors:

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

Stream:

IAB

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DOI:  https://doi.org/10.17487/RFC6912

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Abstract

Internationalized Domain Names in Applications (IDNA) makes availableto DNS zone administrators a very wide range of Unicode code points.Most operators of zones should probably not permit registration ofU-labels using the entire range. This is especially true of zonesthat accept registrations across organizational boundaries, such astop-level domains and, most importantly, the root. It isunfortunately not possible to generate algorithms to determinewhether permitting a code point presents a low risk. This memopresents a set of principles that can be used to guide the decisionof whether a Unicode code point may be wisely included in therepertoire of permissible code points in a U-label in a zone.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.