GB18030
| Range | Codpoints | Characters | |
| GB 11383 | A0 - FE | 128 | 128 |
| Graphical characters | A1A1 - A9FE | 846 | 718 |
| Graphical characters | A840 - A9A0 | 192 | 166 |
| Chinese characters | B0A1 - F7FE | 6768 | 6763 |
| Chinese characters | 8140 - A0FE | 6080 | 6080 |
| Chinese characters | AA40 - FEA0 | 8160 | 8160 |
| User defined area | AAA1 - AFFE | 564 | |
| User defined area | F8A1 - FEFE | 658 | |
| User defined area | A140 - A7A0 | 672 | |
| GB 13000.1 CJK extension A |
This characterset was published on March 17, 2000 by the Ministry of Information Industry (zhōnghuárénmíngònghéguó xìnxí chǎnyèbù) under the name Information technology - Chinese Ideograms coded characterset for information interchange - Extension for the basic set (资讯技术 - 资讯交换用汉字编码字元集 - 基本集的扩充 xìnxíjìshù - xìnxíjiāohuàn yòng hànzì biānmǎ zìfújí - jīběnjí de kuòchōng).
The purpose of this characterset is to combine Unihan Extention A with the previous GB charactersets but also to create enough codepoints for Unicode BMP. To realise this a part of the characters are encoded using one byte (0x00 to 0x7F), a part is encoded using two bytes (0x81 to 0xFE for the first byte and 0x40 to 0x7FE for the second byte), and a part is encoded using 4 bytes (0x81308130 to 0xFE39FE30 or otherwise put 0x8130 to 0xFE39 for the first two bytes and 0x8130 to 0xFE39 for the last two bytes).
link : Ask Dr.International, #15
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