http://www.unicode.org/Public/idna/ This public directory contains data files for UTS #46: Unicode IDNA Compatibility Processing. The directories contain data files associated with a given version of Unicode, such as: http://www.unicode.org/Public/idna/6.0.0 The data files for the latest approved version are also in the directory: directory http://www.unicode.org/Public/idna/latest For more information, including the status of this data, see http://www.unicode.org/reports/tr46/.