CNS 11643

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CNS 11643
Language(s)Traditional Chinese
StandardCNS 11643
ClassificationISO 2022, DBCS, CJK encoding
Encoding formatsEUC-TW, ISO-2022-CN-EXT
Partial encodings: Big5-2003, ISO-2022-CN
Other related encoding(s)Big5, CCCII

The CNS 11643 character set (Chinese National Standard 11643), also officially known as the "Chinese Standard Interchange Code" (中文標準交換碼), is officially the standard character set of the Republic of China. (In practice, variants of Big5 are de facto standard.)

CNS 11643 is a superset of ASCII designed to conform to ISO 2022. It contains 16 planes, so the maximum possible number of encodable characters is 16×94×94 = 141376. Planes 12 to 15 (35344 code points) are specifically designated for user-defined characters.

Unlike CCCII, the encoding of variant characters in CNS 11643 is not related.

EUC-TW is a representation of CNS 11643 in Extended Unix Code (EUC) form.

Relationship to Big5[edit]

Levels 1 and 2 of the Big5 encoding correspond mostly to CNS 11643 planes 1 and 2, respectively, with occasional differences in order. They can be mapped using a list of ranges.[1][2]

The Big5-2003 variant of Big5 is defined as a partial encoding of CNS 11643.


  1. ^ Ken Lunde (1996-07-12). "4.3: CJK Character Set Compatibility Issues - Chinese (Taiwan)". CJK.INF Version 2.1.
  2. ^ Zhu, HF.; Hu, DY.; Wang, ZG.; Kao, TC.; Chang, WCH.; Crispin, M. (1996). "RFC 1922: Chinese Character Encoding for Internet Messages". Requests for Comments. IETF.

External links[edit]