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U+4E00..U+9FFF is part of the complete set, but not all
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The basic block named CJK Unified Ideographs (4E00–9FFF) contains 20,992 basic Chinese characters in the range U+4E00 through U+9FFF. The block not only includes characters used in the Chinese writing system but also kanji used in the Japanese writing system and hanja, whose use is diminishing in Korea.
UTF-8 is a character encoding system. It lets you represent characters as ASCII text, while still allowing for international characters, such as Chinese characters. As of the mid 2020s, UTF-8 is one of the most popular encoding systems.
Unicode/UTF-8 characters include: Chinese characters. any non-Latin scripts (Hebrew, Cyrillic, Japanese, etc.) symbols.
Unicode is widely regarded as politically neutral, has good support for both simplified and traditional characters, and can be easily converted to and from the GB and Big5. Furthermore, Unicode has the advantage of not being limited only to Chinese, since it can also display many other character sets.
May be you would find a complete list through the CJK Unicode FAQ (which does include "Chinese, Japanese, and Korean" characters)
The "East Asian Script" document does mention:
Blocks Containing Han Ideographs
Han ideographic characters are found in five main blocks of the Unicode Standard, as shown in Table 12-2
Table 12-2. Blocks Containing Han Ideographs
Block Range Comment CJK Unified Ideographs 4E00-9FFF Common CJK Unified Ideographs Extension A 3400-4DBF Rare CJK Unified Ideographs Extension B 20000-2A6DF Rare, historic CJK Unified Ideographs Extension C 2A700–2B73F Rare, historic CJK Unified Ideographs Extension D 2B740–2B81F Uncommon, some in current use CJK Unified Ideographs Extension E 2B820–2CEAF Rare, historic CJK Compatibility Ideographs F900-FAFF Duplicates, unifiable variants, corporate characters CJK Compatibility Ideographs Supplement 2F800-2FA1F Unifiable variants Note: the block ranges can evolve over time: latest is in CJK Unified Ideographs.
See also Wikipedia:
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