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=== {{anchor|UTF-5|UTF-6}}Historical: UTF-5 and UTF-6 ===
Proposals have been made for a UTF-5 and UTF-6 for the [[Internationalized ___domain name|internationalization of ___domain names]] (IDN). The UTF-5 proposal used a [[Base32|base 32]] encoding, where [[Punycode]] is (among other things, and not exactly) a [[base 36]] encoding. The name ''UTF-5'' for a code unit of 5 bits is explained by the equation 2<sup>5</sup> = 32.<ref>Seng, James, [https://archive.today/20120721050018/http://tools.ietf.org/html/draft-jseng-utf5 UTF-5, a transformation format of Unicode and ISO 10646], 28 January 2000</ref> The UTF-6 proposal added a running length encoding to UTF-5, here '''6''' simply stands for ''UTF-5 plus 1''.<ref name="UTF-6">{{cite journal |author-last1=Welter |author-first1=Mark |author-last2=Spolarich |author-first2=Brian W. |title=UTF-6 - Yet Another ASCII-Compatible Encoding for ID |url=https://tools.ietf.org/html/draft-ietf-idn-utf6-00 |
The [[Internet Engineering Task Force|IETF]] IDN WG later adopted the more efficient [[Punycode]] for this purpose.<ref>{{Cite web|title=Internationalized Domain Name (idn)|url=http://tools.ietf.org/wg/idn|access-date=2023-03-20|website=tools.ietf.org|language=en}}</ref>
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