ASCII encoding table

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Release: 2017-04-05 11:40:07
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ASCII is the abbreviation of American Standard Code for Information Interchange. ASCII code is currently the most common coding standard for computers. Because computers can only accept numeric information, ASCII codes represent characters as numbers so that the computer can accept and process them. For example, the ASCII code for the capital letter A is 65. In the ASCII code, Nos. 0 to 32 and No. 127 are control characters, commonly used ones are LF (line feed) and CR (carriage return); Nos. 33 to 126 are characters, of which Nos. 48 to 57 are 0 to 9 Arabic numerals; numbers 65 to 90 are 26 uppercase English letters, numbers 97 to 122 are 26 lowercase English letters, and the rest are some punctuation marks, arithmetic symbols, etc.

 ASCII character encoding table

#
ASCII value Control characters ASCII value Control characters ASCII value Control characters ASCII value Control characters
0 NUT 32 (space) 64 @ 96 ,
1 SOH 33 ! 65 A 97 a
2 STX 34 66 B 98 b
3 ETX 35 67 C 99 c
4 EOT 36 $ 68 D 100 d
5 ENQ 37 % 69 E 101 e
6 ACK 38 & 70 F 102 f
7 BEL 39 , 71 G 103 g
8 BS 40 ( 72 H 104 h
9 HT 41 ) 73 I 105 i
10 LF 42 * 74 J 106 j
11 VT 43 + 75 K 107 k
12 FF 44 , 76 L 108 l
13 CR 45 - 77 M 109 m
14 SO 46 . 78 N 110 n
15 SI 47 / 79 O 111 o
16 DLE 48 0 80 P 112 p
17 DCI 49 1 81 Q 113 q
18 DC2 50 2 82 R 114 r
19 DC3 51 3 83 X 115 s
20 DC4 52 4 84 T 116 t
21 NAK 53 5 85 U 117 u
22 SYN 54 6 86 V 118 v
23 TB 55 7 87 W 119 w
24 CAN 56 8 88 X 120 x
25 EM 57 9 89 Y 121 y
26 SUB 58 : 90 Z 122 z
27 ESC 59 ; 91 [ 123 {
28 FS 60 < 92 \ 124 |
29 GS 61 = 93 ] 125 }
30 RS 62 > 94 ^ 126 ~
31 US 63 ? 95 127 DEL

The ASCII value is a decimal number, and the meaning of the control characters is as shown in the following table.

NUL empty VT vertical tab SYN idle synchronization
SOH Title Start FF paper feed control End of ETB message group transmission
STX text begins CR carriage return CAN void
ETX End of text SO shift output EM paper ends
EOY end of transmission SI shift input SUB substitution
ENQ query character DLE space ESC code escape
ACK acknowledge DC1 Device Control 1 FS text separator
BEL alarm DC2 Device Control 2 GS group separator
BS back one space DC3 device control 3 RS record separator
HT horizontal list DC4 Device Control 4 US unit separator
LF line feed NAK negation DEL delete

Since the number of characters in the standard ASCII character set is limited, it often cannot meet the requirements in practical applications. To this end, the International Organization for Standardization has formulated the ISO2022 standard, which stipulates a unified method for extending the ASCII character set to 8-bit codes while maintaining compatibility with ISO646. ISO has successively formulated a batch of extended ASCII character sets suitable for different regions. Each extended ASCII character set can be extended by 128 characters. The encoding of these extended characters is an 8-bit code with a high bit of 1 (that is, decimal numbers 128~255 ), called extended ASCII code.

Extended ASCII characters satisfy the need for more characters. Extended ASCII contains the 128 characters already in ASCII (numbers 0–32 are shown in the image below), plus an additional 128 characters for a total of 256.

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