ASCII Table and ASCII Code

ASCII table and ASCII code with ASCII control characters and ASCII printable characters

Introduction to ASCII table and ASCII code

ASCII stands for American Standard Code for Information Interchange. An ASCII code is the numerical representation of a character since computers can only understand numbers. An ASCII code is a 7-bit character code and every ASCII code represents a unique character. ASCII codes represent text in computers, communications equipment, and other devices. ASCII was developed a long time ago and most modern character-encoding schemes are based on ASCII.

The ASCII code is patterned so that most ASCII control codes are together, and all ASCII pritable codes are together. Now the ASCII control or non-printing characters are rarely used for their original purpose. Below is the ASCII character table and descriptions of the first 32 ASCII non-printing characters.

ASCII table and ASCII code

The first 32 ASCII codes are ASCII control characters. Others are ASCII printable characters.

               ASCII Table and ASCII Code ( 0 - 127 )

   Decimal Octal Hex   Binairy   Character 
   ------- ----- ----  --------  ---------------------------- 
       000  000  0x00  00000000  NUL  (Null char.)
       001  001  0x01  00000001  SOH  (Start of Header)
       002  002  0x02  00000010  STX  (Start of Text)
       003  003  0x03  00000011  ETX  (End of Text)
       004  004  0x04  00000100  EOT  (End of Transmission)
       005  005  0x05  00000101  ENQ  (Enquiry)
       006  006  0x06  00000110  ACK  (Acknowledgment)
       007  007  0x07  00000111  BEL  (Bell)
       008  010  0x08  00001000   BS  (Backspace)
       009  011  0x09  00001001   HT  (Horizontal Tab)
       010  012  0x0A  00001010   LF  (Line Feed)
       011  013  0x0B  00001011   VT  (Vertical Tab)
       012  014  0x0C  00001100   FF  (Form Feed)
       013  015  0x0D  00001101   CR  (Carriage Return)
       014  016  0x0E  00001110   SO  (Shift Out)
       015  017  0x0F  00001111   SI  (Shift In)
       016  020  0x10  00010000  DLE  (Data Link Escape)
       017  021  0x11  00010001  DC1  (XON)(Device Control 1)
       018  022  0x12  00010010  DC2  (Device Control 2)
       019  023  0x13  00010011  DC3  (XOFF)(Device Control 3)
       020  024  0x14  00010100  DC4  (Device Control 4)
       021  025  0x15  00010101  NAK  (Negative Acknowledgement)
       022  026  0x16  00010110  SYN  (Synchronous Idle)
       023  027  0x17  00010111  ETB  (End of Trans. Block)
       024  030  0x18  00011000  CAN  (Cancel)
       025  031  0x19  00011001   EM  (End of Medium)
       026  032  0x1A  00011010  SUB  (Substitute)
       027  033  0x1B  00011011  ESC  (Escape)
       028  034  0x1C  00011100   FS  (File Separator)
       029  035  0x1D  00011101   GS  (Group Separator)
 ctrl  030  036  0x1E  00011110   RS  (Request to Send)(Record Separator)
 code  031  037  0x1F  00011111   US  (Unit Separator)
---------- ----- ----  --------  ---------------------------- 
 prnt- 032  040  0x20  00100000   SP  (Space)
 able  033  041  0x21  00100001    !  (exclamation mark)
 code  034  042  0x22  00100010    "  (double quote)
       035  043  0x23  00100011    #  (number sign)
       036  044  0x24  00100100    $  (dollar sign)
       037  045  0x25  00100101    %  (percent)
       038  046  0x26  00100110    &  (ampersand)
       039  047  0x27  00100111    '  (single quote)
       040  050  0x28  00101000    (  (left opening parenthesis)
       041  051  0x29  00101001    )  (right closing parenthesis)
       042  052  0x2A  00101010    *  (asterisk)
       043  053  0x2B  00101011    +  (plus)
       044  054  0x2C  00101100    ,  (comma)
       045  055  0x2D  00101101    -  (minus or dash)
       046  056  0x2E  00101110    .  (dot)
       047  057  0x2F  00101111    /  (forward slash)
       048  060  0x30  00110000    0
       049  061  0x31  00110001    1
       050  062  0x32  00110010    2
       051  063  0x33  00110011    3
       052  064  0x34  00110100    4
       053  065  0x35  00110101    5
       054  066  0x36  00110110    6
       055  067  0x37  00110111    7
       056  070  0x38  00111000    8
       057  071  0x39  00111001    9
       058  072  0x3A  00111010    :  (colon)
       059  073  0x3B  00111011    ;  (semi-colon)
       060  074  0x3C  00111100    <  (less than sign)
       061  075  0x3D  00111101    =  (equal sign)
       062  076  0x3E  00111110    >  (greater than sign)
       063  077  0x3F  00111111    ?  (question mark)
       064  100  0x40  01000000    @  (AT symbol)
       065  101  0x41  01000001    A
       066  102  0x42  01000010    B
       067  103  0x43  01000011    C
       068  104  0x44  01000100    D
       069  105  0x45  01000101    E
       070  106  0x46  01000110    F
       071  107  0x47  01000111    G
       072  110  0x48  01001000    H
       073  111  0x49  01001001    I
       074  112  0x4A  01001010    J
       075  113  0x4B  01001011    K
       076  114  0x4C  01001100    L
       077  115  0x4D  01001101    M
       078  116  0x4E  01001110    N
       079  117  0x4F  01001111    O
       080  120  0x50  01010000    P
       081  121  0x51  01010001    Q
       082  122  0x52  01010010    R
       083  123  0x53  01010011    S
       084  124  0x54  01010100    T
       085  125  0x55  01010101    U
       086  126  0x56  01010110    V
       087  127  0x57  01010111    W
       088  130  0x58  01011000    X
       089  131  0x59  01011001    Y
       090  132  0x5A  01011010    Z
       091  133  0x5B  01011011    [  (left opening bracket)
       092  134  0x5C  01011100    \  (back slash)
       093  135  0x5D  01011101    ]  (right closing bracket)
       094  136  0x5E  01011110    ^  (caret cirumflex)
       095  137  0x5F  01011111    _  (underscore)
       096  140  0x60  01100000    `
       097  141  0x61  01100001    a
       098  142  0x62  01100010    b
       099  143  0x63  01100011    c
       100  144  0x64  01100100    d
       101  145  0x65  01100101    e
       102  146  0x66  01100110    f
       103  147  0x67  01100111    g
       104  150  0x68  01101000    h
       105  151  0x69  01101001    i
       106  152  0x6A  01101010    j
       107  153  0x6B  01101011    k
       108  154  0x6C  01101100    l
       109  155  0x6D  01101101    m
       110  156  0x6E  01101110    n
       111  157  0x6F  01101111    o
       112  160  0x70  01110000    p
       113  161  0x71  01110001    q
       114  162  0x72  01110010    r
       115  163  0x73  01110011    s
       116  164  0x74  01110100    t
       117  165  0x75  01110101    u
       118  166  0x76  01110110    v
       119  167  0x77  01110111    w
       120  170  0x78  01111000    x
       121  171  0x79  01111001    y
       122  172  0x7A  01111010    z
       123  173  0x7B  01111011    {  (left opening brace)
       124  174  0x7C  01111100    |  (vertical bar)
       125  175  0x7D  01111101    }  (right closing brace)
       126  176  0x7E  01111110    ~  (tilde)
       127  177  0x7F  01111111  DEL  (delete)

A compact ASCII table. Download it in a txt file.

 Char Dec  Oct  Hex | Char Dec Oct  Hex | Char Dec Oct  Hex | Char Dec  Oct   Hex
 -------------------------------------------------------------------------------
 (nul)  0 0000 0x00 | (sp) 32 0040 0x20 | @    64 0100 0x40 | `     96 0140 0x60
 (soh)  1 0001 0x01 | !    33 0041 0x21 | A    65 0101 0x41 | a     97 0141 0x61
 (stx)  2 0002 0x02 | "    34 0042 0x22 | B    66 0102 0x42 | b     98 0142 0x62
 (etx)  3 0003 0x03 | #    35 0043 0x23 | C    67 0103 0x43 | c     99 0143 0x63
 (eot)  4 0004 0x04 | $    36 0044 0x24 | D    68 0104 0x44 | d    100 0144 0x64
 (enq)  5 0005 0x05 | %    37 0045 0x25 | E    69 0105 0x45 | e    101 0145 0x65
 (ack)  6 0006 0x06 | &    38 0046 0x26 | F    70 0106 0x46 | f    102 0146 0x66
 (bel)  7 0007 0x07 | '    39 0047 0x27 | G    71 0107 0x47 | g    103 0147 0x67
 (bs)   8 0010 0x08 | (    40 0050 0x28 | H    72 0110 0x48 | h    104 0150 0x68
 (ht)   9 0011 0x09 | )    41 0051 0x29 | I    73 0111 0x49 | i    105 0151 0x69
 (nl)  10 0012 0x0a | *    42 0052 0x2a | J    74 0112 0x4a | j    106 0152 0x6a
 (vt)  11 0013 0x0b | +    43 0053 0x2b | K    75 0113 0x4b | k    107 0153 0x6b
 (np)  12 0014 0x0c | ,    44 0054 0x2c | L    76 0114 0x4c | l    108 0154 0x6c
 (cr)  13 0015 0x0d | -    45 0055 0x2d | M    77 0115 0x4d | m    109 0155 0x6d
 (so)  14 0016 0x0e | .    46 0056 0x2e | N    78 0116 0x4e | n    110 0156 0x6e
 (si)  15 0017 0x0f | /    47 0057 0x2f | O    79 0117 0x4f | o    111 0157 0x6f
 (dle) 16 0020 0x10 | 0    48 0060 0x30 | P    80 0120 0x50 | p    112 0160 0x70
 (dc1) 17 0021 0x11 | 1    49 0061 0x31 | Q    81 0121 0x51 | q    113 0161 0x71
 (dc2) 18 0022 0x12 | 2    50 0062 0x32 | R    82 0122 0x52 | r    114 0162 0x72
 (dc3) 19 0023 0x13 | 3    51 0063 0x33 | S    83 0123 0x53 | s    115 0163 0x73
 (dc4) 20 0024 0x14 | 4    52 0064 0x34 | T    84 0124 0x54 | t    116 0164 0x74
 (nak) 21 0025 0x15 | 5    53 0065 0x35 | U    85 0125 0x55 | u    117 0165 0x75
 (syn) 22 0026 0x16 | 6    54 0066 0x36 | V    86 0126 0x56 | v    118 0166 0x76
 (etb) 23 0027 0x17 | 7    55 0067 0x37 | W    87 0127 0x57 | w    119 0167 0x77
 (can) 24 0030 0x18 | 8    56 0070 0x38 | X    88 0130 0x58 | x    120 0170 0x78
 (em)  25 0031 0x19 | 9    57 0071 0x39 | Y    89 0131 0x59 | y    121 0171 0x79
 (sub) 26 0032 0x1a | :    58 0072 0x3a | Z    90 0132 0x5a | z    122 0172 0x7a
 (esc) 27 0033 0x1b | ;    59 0073 0x3b | [    91 0133 0x5b | {    123 0173 0x7b
 (fs)  28 0034 0x1c | <    60 0074 0x3c | \    92 0134 0x5c | |    124 0174 0x7c
 (gs)  29 0035 0x1d | =    61 0075 0x3d | ]    93 0135 0x5d | }    125 0175 0x7d
 (rs)  30 0036 0x1e | >    62 0076 0x3e | ^    94 0136 0x5e | ~    126 0176 0x7e
 (us)  31 0037 0x1f | ?    63 0077 0x3f | _    95 0137 0x5f | (del)127 0177 0x7f

American Standard Code for Information Interchange – ASA standard X3.4-1963: scanned copy.

Also check the Linux ascii Man page.

About Eric Zhiqiang Ma

Eric Zhiqiang Ma is a PhD candidate at Dep. of CSE, HKUST. He is interested in system software for cloud computing, virtualization of large-scale distributed systems and etc. Also find Eric on Facebook, Twitter, LinkedIn and Google+. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties. More Posts - Website

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