The Chinese, Japanese and Korean (CJK) scripts share a common background. In the process called Han unification the common (shared) characters were identified, and named “CJK Unified Ideographs”. Unicode defines a total of 74,617 CJK Unified Ideographs.
CJK Unified Ideographs
http://www.unicode.org/charts/PDF/U4E00.pdf
The Unicode Consortium
http://unicode.org/
Unicode Standard Annex #38
UNICODE HAN DATABASE (UNIHAN)
http://www.unicode.org/reports/tr38/
Unicode Standard Annex #44
UNICODE CHARACTER DATABASE
http://www.unicode.org/reports/tr44/
CJK UNIFIED IDEOGRAPH
3400..4DB5 ; Unified_Ideograph # Lo [6582]
4E00..9FCC ; Unified_Ideograph # Lo [20941]
FA0E..FA0F ; Unified_Ideograph # Lo [2]
FA11 ; Unified_Ideograph # Lo [1]
FA13..FA14 ; Unified_Ideograph # Lo [2]
FA1F ; Unified_Ideograph # Lo [1]
FA21 ; Unified_Ideograph # Lo [1]
FA23..FA24 ; Unified_Ideograph # Lo [2]
FA27..FA29 ; Unified_Ideograph # Lo [3]
20000..2A6D6 ; Unified_Ideograph # Lo [42711]
2A700..2B734 ; Unified_Ideograph # Lo [4149]
2B740..2B81D ; Unified_Ideograph # Lo [222]
# Total code points: 74617