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Computer Science Reference

ASCII Table

ASCII assigns a number from 0 to 127 to each of the basic Latin characters: 0–31 are non-printing control codes, 32 is space, 48–57 are the digits, 65–90 the uppercase letters and 97–122 the lowercase. This table gives every character in decimal, hex, octal, binary and HTML entity form.

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Control Codes

33

The 33 non-printing codes (0–31 and 127) that steer devices and streams.

Punctuation & Symbols

33

Space, punctuation and mathematical symbols.

Digits (48–57)

10

The decimal digits 0 to 9.

Uppercase (65–90)

26

The capital letters A to Z.

Lowercase (97–122)

26

The small letters a to z.

All ASCII Table (128)

Control Codes (33)

The 33 non-printing codes (0–31 and 127) that steer devices and streams.

0

Char

NUL

Name

NUL — Null

Hex · Oct · Binary · HTML

0x00 · 0000 · 00000000 · �

1

Char

SOH

Name

SOH — Start of Heading

Hex · Oct · Binary · HTML

0x01 · 0001 · 00000001 · 

2

Char

STX

Name

STX — Start of Text

Hex · Oct · Binary · HTML

0x02 · 0002 · 00000010 · 

3

Char

ETX

Name

ETX — End of Text

Hex · Oct · Binary · HTML

0x03 · 0003 · 00000011 · 

4

Char

EOT

Name

EOT — End of Transmission

Hex · Oct · Binary · HTML

0x04 · 0004 · 00000100 · 

5

Char

ENQ

Name

ENQ — Enquiry

Hex · Oct · Binary · HTML

0x05 · 0005 · 00000101 · 

6

Char

ACK

Name

ACK — Acknowledge

Hex · Oct · Binary · HTML

0x06 · 0006 · 00000110 · 

7

Char

BEL

Name

BEL — Bell — rang a physical bell on a teletype

Hex · Oct · Binary · HTML

0x07 · 0007 · 00000111 · 

8

Char

BS

Name

BS — Backspace

Hex · Oct · Binary · HTML

0x08 · 0010 · 00001000 · 

9

Char

HT

Name

HT — Horizontal Tab

Hex · Oct · Binary · HTML

0x09 · 0011 · 00001001 · 	

10

Char

LF

Name

LF — Line Feed — ends a line on Unix

Hex · Oct · Binary · HTML

0x0A · 0012 · 00001010 · 


11

Char

VT

Name

VT — Vertical Tab

Hex · Oct · Binary · HTML

0x0B · 0013 · 00001011 · 

12

Char

FF

Name

FF — Form Feed — page break

Hex · Oct · Binary · HTML

0x0C · 0014 · 00001100 · 

13

Char

CR

Name

CR — Carriage Return — paired with LF on Windows

Hex · Oct · Binary · HTML

0x0D · 0015 · 00001101 · 

14

Char

SO

Name

SO — Shift Out

Hex · Oct · Binary · HTML

0x0E · 0016 · 00001110 · 

15

Char

SI

Name

SI — Shift In

Hex · Oct · Binary · HTML

0x0F · 0017 · 00001111 · 

16

Char

DLE

Name

DLE — Data Link Escape

Hex · Oct · Binary · HTML

0x10 · 0020 · 00010000 · 

17

Char

DC1

Name

DC1 — Device Control 1 — XON, resumes flow

Hex · Oct · Binary · HTML

0x11 · 0021 · 00010001 · 

18

Char

DC2

Name

DC2 — Device Control 2

Hex · Oct · Binary · HTML

0x12 · 0022 · 00010010 · 

19

Char

DC3

Name

DC3 — Device Control 3 — XOFF, pauses flow

Hex · Oct · Binary · HTML

0x13 · 0023 · 00010011 · 

20

Char

DC4

Name

DC4 — Device Control 4

Hex · Oct · Binary · HTML

0x14 · 0024 · 00010100 · 

21

Char

NAK

Name

NAK — Negative Acknowledge

Hex · Oct · Binary · HTML

0x15 · 0025 · 00010101 · 

22

Char

SYN

Name

SYN — Synchronous Idle

Hex · Oct · Binary · HTML

0x16 · 0026 · 00010110 · 

23

Char

ETB

Name

ETB — End of Transmission Block

Hex · Oct · Binary · HTML

0x17 · 0027 · 00010111 · 

24

Char

CAN

Name

CAN — Cancel

Hex · Oct · Binary · HTML

0x18 · 0030 · 00011000 · 

25

Char

EM

Name

EM — End of Medium

Hex · Oct · Binary · HTML

0x19 · 0031 · 00011001 · 

26

Char

SUB

Name

SUB — Substitute

Hex · Oct · Binary · HTML

0x1A · 0032 · 00011010 · 

27

Char

ESC

Name

ESC — Escape — begins every ANSI terminal sequence

Hex · Oct · Binary · HTML

0x1B · 0033 · 00011011 · 

28

Char

FS

Name

FS — File Separator

Hex · Oct · Binary · HTML

0x1C · 0034 · 00011100 · 

29

Char

GS

Name

GS — Group Separator

Hex · Oct · Binary · HTML

0x1D · 0035 · 00011101 · 

30

Char

RS

Name

RS — Record Separator

Hex · Oct · Binary · HTML

0x1E · 0036 · 00011110 · 

31

Char

US

Name

US — Unit Separator

Hex · Oct · Binary · HTML

0x1F · 0037 · 00011111 · 

127

Char

DEL

Name

DEL — Delete

Hex · Oct · Binary · HTML

0x7F · 0177 · 01111111 · 

Punctuation & Symbols (33)

Space, punctuation and mathematical symbols.

32

Char

SP

Name

Space

Hex · Oct · Binary · HTML

0x20 · 0040 · 00100000 ·  

33

Char

!

Name

Exclamation mark

Hex · Oct · Binary · HTML

0x21 · 0041 · 00100001 · !

34

Char

"

Name

Quotation mark

Hex · Oct · Binary · HTML

0x22 · 0042 · 00100010 · "

35

Char

#

Name

Number sign (hash)

Hex · Oct · Binary · HTML

0x23 · 0043 · 00100011 · #

36

Char

$

Name

Dollar sign

Hex · Oct · Binary · HTML

0x24 · 0044 · 00100100 · $

37

Char

%

Name

Percent sign

Hex · Oct · Binary · HTML

0x25 · 0045 · 00100101 · %

38

Char

&

Name

Ampersand

Hex · Oct · Binary · HTML

0x26 · 0046 · 00100110 · &

39

Char

'

Name

Apostrophe

Hex · Oct · Binary · HTML

0x27 · 0047 · 00100111 · '

40

Char

(

Name

Left parenthesis

Hex · Oct · Binary · HTML

0x28 · 0050 · 00101000 · (

41

Char

)

Name

Right parenthesis

Hex · Oct · Binary · HTML

0x29 · 0051 · 00101001 · )

42

Char

*

Name

Asterisk

Hex · Oct · Binary · HTML

0x2A · 0052 · 00101010 · *

43

Char

+

Name

Plus sign

Hex · Oct · Binary · HTML

0x2B · 0053 · 00101011 · +

44

Char

,

Name

Comma

Hex · Oct · Binary · HTML

0x2C · 0054 · 00101100 · ,

45

Char

-

Name

Hyphen-minus

Hex · Oct · Binary · HTML

0x2D · 0055 · 00101101 · -

46

Char

.

Name

Full stop (period)

Hex · Oct · Binary · HTML

0x2E · 0056 · 00101110 · .

47

Char

/

Name

Solidus (forward slash)

Hex · Oct · Binary · HTML

0x2F · 0057 · 00101111 · /

58

Char

:

Name

Colon

Hex · Oct · Binary · HTML

0x3A · 0072 · 00111010 · :

59

Char

;

Name

Semicolon

Hex · Oct · Binary · HTML

0x3B · 0073 · 00111011 · &#59;

60

Char

<

Name

Less-than sign

Hex · Oct · Binary · HTML

0x3C · 0074 · 00111100 · &lt;

61

Char

=

Name

Equals sign

Hex · Oct · Binary · HTML

0x3D · 0075 · 00111101 · &#61;

62

Char

>

Name

Greater-than sign

Hex · Oct · Binary · HTML

0x3E · 0076 · 00111110 · &gt;

63

Char

?

Name

Question mark

Hex · Oct · Binary · HTML

0x3F · 0077 · 00111111 · &#63;

64

Char

@

Name

Commercial at

Hex · Oct · Binary · HTML

0x40 · 0100 · 01000000 · &#64;

91

Char

[

Name

Left square bracket

Hex · Oct · Binary · HTML

0x5B · 0133 · 01011011 · &#91;

92

Char

\

Name

Reverse solidus (backslash)

Hex · Oct · Binary · HTML

0x5C · 0134 · 01011100 · &#92;

93

Char

]

Name

Right square bracket

Hex · Oct · Binary · HTML

0x5D · 0135 · 01011101 · &#93;

94

Char

^

Name

Circumflex accent (caret)

Hex · Oct · Binary · HTML

0x5E · 0136 · 01011110 · &#94;

95

Char

_

Name

Low line (underscore)

Hex · Oct · Binary · HTML

0x5F · 0137 · 01011111 · &#95;

96

Char

`

Name

Grave accent (backtick)

Hex · Oct · Binary · HTML

0x60 · 0140 · 01100000 · &#96;

123

Char

{

Name

Left curly brace

Hex · Oct · Binary · HTML

0x7B · 0173 · 01111011 · &#123;

124

Char

|

Name

Vertical line (pipe)

Hex · Oct · Binary · HTML

0x7C · 0174 · 01111100 · &#124;

125

Char

}

Name

Right curly brace

Hex · Oct · Binary · HTML

0x7D · 0175 · 01111101 · &#125;

126

Char

~

Name

Tilde

Hex · Oct · Binary · HTML

0x7E · 0176 · 01111110 · &#126;

Digits (48–57) (10)

The decimal digits 0 to 9.

48

Char

0

Name

Digit zero

Hex · Oct · Binary · HTML

0x30 · 0060 · 00110000 · &#48;

49

Char

1

Name

Digit one

Hex · Oct · Binary · HTML

0x31 · 0061 · 00110001 · &#49;

50

Char

2

Name

Digit two

Hex · Oct · Binary · HTML

0x32 · 0062 · 00110010 · &#50;

51

Char

3

Name

Digit three

Hex · Oct · Binary · HTML

0x33 · 0063 · 00110011 · &#51;

52

Char

4

Name

Digit four

Hex · Oct · Binary · HTML

0x34 · 0064 · 00110100 · &#52;

53

Char

5

Name

Digit five

Hex · Oct · Binary · HTML

0x35 · 0065 · 00110101 · &#53;

54

Char

6

Name

Digit six

Hex · Oct · Binary · HTML

0x36 · 0066 · 00110110 · &#54;

55

Char

7

Name

Digit seven

Hex · Oct · Binary · HTML

0x37 · 0067 · 00110111 · &#55;

56

Char

8

Name

Digit eight

Hex · Oct · Binary · HTML

0x38 · 0070 · 00111000 · &#56;

57

Char

9

Name

Digit nine

Hex · Oct · Binary · HTML

0x39 · 0071 · 00111001 · &#57;

Uppercase (65–90) (26)

The capital letters A to Z.

65

Char

A

Name

Latin capital letter A

Hex · Oct · Binary · HTML

0x41 · 0101 · 01000001 · &#65;

66

Char

B

Name

Latin capital letter B

Hex · Oct · Binary · HTML

0x42 · 0102 · 01000010 · &#66;

67

Char

C

Name

Latin capital letter C

Hex · Oct · Binary · HTML

0x43 · 0103 · 01000011 · &#67;

68

Char

D

Name

Latin capital letter D

Hex · Oct · Binary · HTML

0x44 · 0104 · 01000100 · &#68;

69

Char

E

Name

Latin capital letter E

Hex · Oct · Binary · HTML

0x45 · 0105 · 01000101 · &#69;

70

Char

F

Name

Latin capital letter F

Hex · Oct · Binary · HTML

0x46 · 0106 · 01000110 · &#70;

71

Char

G

Name

Latin capital letter G

Hex · Oct · Binary · HTML

0x47 · 0107 · 01000111 · &#71;

72

Char

H

Name

Latin capital letter H

Hex · Oct · Binary · HTML

0x48 · 0110 · 01001000 · &#72;

73

Char

I

Name

Latin capital letter I

Hex · Oct · Binary · HTML

0x49 · 0111 · 01001001 · &#73;

74

Char

J

Name

Latin capital letter J

Hex · Oct · Binary · HTML

0x4A · 0112 · 01001010 · &#74;

75

Char

K

Name

Latin capital letter K

Hex · Oct · Binary · HTML

0x4B · 0113 · 01001011 · &#75;

76

Char

L

Name

Latin capital letter L

Hex · Oct · Binary · HTML

0x4C · 0114 · 01001100 · &#76;

77

Char

M

Name

Latin capital letter M

Hex · Oct · Binary · HTML

0x4D · 0115 · 01001101 · &#77;

78

Char

N

Name

Latin capital letter N

Hex · Oct · Binary · HTML

0x4E · 0116 · 01001110 · &#78;

79

Char

O

Name

Latin capital letter O

Hex · Oct · Binary · HTML

0x4F · 0117 · 01001111 · &#79;

80

Char

P

Name

Latin capital letter P

Hex · Oct · Binary · HTML

0x50 · 0120 · 01010000 · &#80;

81

Char

Q

Name

Latin capital letter Q

Hex · Oct · Binary · HTML

0x51 · 0121 · 01010001 · &#81;

82

Char

R

Name

Latin capital letter R

Hex · Oct · Binary · HTML

0x52 · 0122 · 01010010 · &#82;

83

Char

S

Name

Latin capital letter S

Hex · Oct · Binary · HTML

0x53 · 0123 · 01010011 · &#83;

84

Char

T

Name

Latin capital letter T

Hex · Oct · Binary · HTML

0x54 · 0124 · 01010100 · &#84;

85

Char

U

Name

Latin capital letter U

Hex · Oct · Binary · HTML

0x55 · 0125 · 01010101 · &#85;

86

Char

V

Name

Latin capital letter V

Hex · Oct · Binary · HTML

0x56 · 0126 · 01010110 · &#86;

87

Char

W

Name

Latin capital letter W

Hex · Oct · Binary · HTML

0x57 · 0127 · 01010111 · &#87;

88

Char

X

Name

Latin capital letter X

Hex · Oct · Binary · HTML

0x58 · 0130 · 01011000 · &#88;

89

Char

Y

Name

Latin capital letter Y

Hex · Oct · Binary · HTML

0x59 · 0131 · 01011001 · &#89;

90

Char

Z

Name

Latin capital letter Z

Hex · Oct · Binary · HTML

0x5A · 0132 · 01011010 · &#90;

Lowercase (97–122) (26)

The small letters a to z.

97

Char

a

Name

Latin small letter a

Hex · Oct · Binary · HTML

0x61 · 0141 · 01100001 · &#97;

98

Char

b

Name

Latin small letter b

Hex · Oct · Binary · HTML

0x62 · 0142 · 01100010 · &#98;

99

Char

c

Name

Latin small letter c

Hex · Oct · Binary · HTML

0x63 · 0143 · 01100011 · &#99;

100

Char

d

Name

Latin small letter d

Hex · Oct · Binary · HTML

0x64 · 0144 · 01100100 · &#100;

101

Char

e

Name

Latin small letter e

Hex · Oct · Binary · HTML

0x65 · 0145 · 01100101 · &#101;

102

Char

f

Name

Latin small letter f

Hex · Oct · Binary · HTML

0x66 · 0146 · 01100110 · &#102;

103

Char

g

Name

Latin small letter g

Hex · Oct · Binary · HTML

0x67 · 0147 · 01100111 · &#103;

104

Char

h

Name

Latin small letter h

Hex · Oct · Binary · HTML

0x68 · 0150 · 01101000 · &#104;

105

Char

i

Name

Latin small letter i

Hex · Oct · Binary · HTML

0x69 · 0151 · 01101001 · &#105;

106

Char

j

Name

Latin small letter j

Hex · Oct · Binary · HTML

0x6A · 0152 · 01101010 · &#106;

107

Char

k

Name

Latin small letter k

Hex · Oct · Binary · HTML

0x6B · 0153 · 01101011 · &#107;

108

Char

l

Name

Latin small letter l

Hex · Oct · Binary · HTML

0x6C · 0154 · 01101100 · &#108;

109

Char

m

Name

Latin small letter m

Hex · Oct · Binary · HTML

0x6D · 0155 · 01101101 · &#109;

110

Char

n

Name

Latin small letter n

Hex · Oct · Binary · HTML

0x6E · 0156 · 01101110 · &#110;

111

Char

o

Name

Latin small letter o

Hex · Oct · Binary · HTML

0x6F · 0157 · 01101111 · &#111;

112

Char

p

Name

Latin small letter p

Hex · Oct · Binary · HTML

0x70 · 0160 · 01110000 · &#112;

113

Char

q

Name

Latin small letter q

Hex · Oct · Binary · HTML

0x71 · 0161 · 01110001 · &#113;

114

Char

r

Name

Latin small letter r

Hex · Oct · Binary · HTML

0x72 · 0162 · 01110010 · &#114;

115

Char

s

Name

Latin small letter s

Hex · Oct · Binary · HTML

0x73 · 0163 · 01110011 · &#115;

116

Char

t

Name

Latin small letter t

Hex · Oct · Binary · HTML

0x74 · 0164 · 01110100 · &#116;

117

Char

u

Name

Latin small letter u

Hex · Oct · Binary · HTML

0x75 · 0165 · 01110101 · &#117;

118

Char

v

Name

Latin small letter v

Hex · Oct · Binary · HTML

0x76 · 0166 · 01110110 · &#118;

119

Char

w

Name

Latin small letter w

Hex · Oct · Binary · HTML

0x77 · 0167 · 01110111 · &#119;

120

Char

x

Name

Latin small letter x

Hex · Oct · Binary · HTML

0x78 · 0170 · 01111000 · &#120;

121

Char

y

Name

Latin small letter y

Hex · Oct · Binary · HTML

0x79 · 0171 · 01111001 · &#121;

122

Char

z

Name

Latin small letter z

Hex · Oct · Binary · HTML

0x7A · 0172 · 01111010 · &#122;

Frequently Asked Questions

How do I convert a letter to its ASCII code?

Look it up in the table, or in code use the language's ordinal function: ord("A") in Python and "A".charCodeAt(0) in JavaScript both give 65. Going back is chr(65) and String.fromCharCode(65).

What is the difference between ASCII and UTF-8?

ASCII defines 128 characters in 7 bits. UTF-8 encodes the whole of Unicode using one to four bytes per character, and is designed so that its one-byte encodings are exactly ASCII — every ASCII file is already valid UTF-8, which is why UTF-8 won.

Why is uppercase A 65 and lowercase a 97?

The gap is exactly 32, which is a single bit (bit 5). That was deliberate: flipping one bit converts between cases, so early hardware could change case with a bitwise OR or AND rather than a lookup table.

What are ASCII control characters used for?

They predate screens and were device commands: 10 is line feed and 13 carriage return, still used to end lines; 9 is tab; 7 rang a physical bell; 0 terminates strings in C. Most of the rest are historical, though 27 (escape) still starts every ANSI terminal sequence.

Related Reading

#ASCII#CharacterEncoding#Unicode#ComputerScience#DataRepresentation#Fundamentals#InterviewPrep#TechnicalInterview#QuickReference#DeveloperReference#KnowledgeHub#SkillVeris#AsciiTable#AsciiCodes#AsciiChart

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Kabir M. · CS Undergraduate
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