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@misc{rfc3492, series = {Request for Comments}, number = 3492, howpublished = {RFC 3492}, publisher = {RFC Editor}, doi = {10.17487/RFC3492}, url = {https://www.rfc-editor.org/info/rfc3492}, author = {Adam M. Costello}, title = {{Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)}}, pagetotal = 35, year = 2003, month = mar, abstract = {Punycode is a simple and efficient transfer encoding syntax designed for use with Internationalized Domain Names in Applications (IDNA). It uniquely and reversibly transforms a Unicode string into an ASCII string. ASCII characters in the Unicode string are represented literally, and non-ASCII characters are represented by ASCII characters that are allowed in host name labels (letters, digits, and hyphens). This document defines a general algorithm called Bootstring that allows a string of basic code points to uniquely represent any string of code points drawn from a larger set. Punycode is an instance of Bootstring that uses particular parameter values specified by this document, appropriate for IDNA. {[}STANDARDS-TRACK{]}}, }