ASCII Table
ASCII is (strictly) 7 bit. Codes 0 to 31 (decimal) are denoted as control codes - codes with special meanings for I/O devices. ASCII codes 32 to 127 represent the "standard" set of ASCII characters.
ASCII Control Codes
Hex Decimal Abbreviations Name 00 0 ©@ NUL Null 01 1 ©A SOH Start of Heading 02 2 ©B STX Start of Text 03 3 ©C ETX End of Text 04 4 ©D EOT End of Transmit 05 5 ©E ENQ Enquiry 06 6 ©F ACK Acknowledge 07 7 ©G BEL Bell 08 8 ©H BS Back Space 09 9 ©I HT Horizontal Tab 0A 10 ©J LF Line Feed 0B 11 ©K VT Vertical Tab 0C 12 ©L FF Form Feed 0D 13 ©M CR Carriage Return 0E 14 ©N SO Shift Out / X-On 0F 15 ©O SI Shift In / X-Off 10 16 ©P DLE Data Line Escape 11 17 ©Q DC1 Device Control 1. 12 18 ©R DC2 Device Control 2. 13 19 ©S DC3 Device Control 3. 14 20 ©T DC4 Device Control 4. 15 21 ©U NAK Negative Acknowledge 16 22 ©V SYN Synchronous idle. 17 23 ©W ETB End of Transmit Block 18 24 ©X CAN Cancel 19 25 ©Y EM End of Medium 1A 26 ©Z SUB Substitute 1B 27 ©[ ESC Escape 1C 28 ©\ FS File Separator 1D 29 ©] GS Group Separator 1E 30 ©^ RS Record Separator 1F 31 ©_ US Unit Separator.
Where © stands for 'control'.
ASCII Characters
Hex Decimal Symbol HTML Name 20 32 space   space 21 33 ! ! exclamation mark 22 34 " " " double quotes (or speech marks) 23 35 # # number 24 36 $ $ dollar 25 37 % % percent 26 38 & & & ampersand 27 39 ' ' single quote 28 40 ( ( open parenthesis (or open bracket) 29 41 ) ) close parenthesis (or close bracket) 2A 42 * * asterisk 2B 43 + + plus 2C 44 , , comma 2D 45 - - hyphen 2E 46 . . period, dot or full stop 2F 47 / / slash or divide 30 48 0 0 zero 31 49 1 1 one 32 50 2 2 two 33 51 3 3 three 34 52 4 4 four 35 53 5 5 five 36 54 6 6 six 37 55 7 7 seven 38 56 8 8 eight 39 57 9 9 nine 3A 58 : : colon 3B 59 ; ; semicolon 3C 60 < < < less than (or open angled bracket) 3D 61 = = equals 3E 62 > > > greater than (or close angled bracket) 3F 62 ? ? question mark 40 64 @ @ at symbol 41 65 A A uppercase A 42 66 B B uppercase B 43 67 C C uppercase C 44 68 D D uppercase D 45 69 E E uppercase E 46 70 F F uppercase F 47 71 G G uppercase G 48 72 H H uppercase H 49 73 I I uppercase I 4A 74 J J uppercase J 4B 75 K K uppercase K 4C 76 L L uppercase L 4D 77 M M uppercase M 4E 78 N N uppercase N 4F 79 O O uppercase O 50 80 P P uppercase P 51 81 Q Q uppercase Q 52 82 R R uppercase R 53 83 S S uppercase S 54 84 T T uppercase T 55 85 U U uppercase U 56 86 V V uppercase V 57 87 W W uppercase W 58 88 X X uppercase X 59 89 Y Y uppercase Y 5A 90 Z Z uppercase Z 5B 91 [ [ open square bracket 5C 92 \ \ backslash 5D 93 ] ] close square bracket 5E 94 ^ ^ caret 5F 95 _ _ underscore 60 96 ` ` acute accent 61 97 a a lowercase a 62 98 b b lowercase b 63 99 c c lowercase c 64 100 d d lowercase d 65 101 e e lowercase e 66 102 f f lowercase f 67 103 g g lowercase g 68 104 h h lowercase h 69 105 i i lowercase i 6A 106 j j lowercase j 6B 107 k k lowercase k 6C 108 l l lowercase l 6D 109 m m lowercase m 6E 110 n n lowercase n 6F 111 o o lowercase o 70 112 p p lowercase p 71 113 q q lowercase q 72 114 r r lowercase r 73 115 s s lowercase s 74 116 t t lowercase t 75 117 u u lowercase u 76 118 v v lowercase v 77 119 w w lowercase w 78 120 x x lowercase x 79 121 y y lowercase y 7A 122 z z lowercase z 7B 123 { { opening brace 7C 124 | | bar 7D 125 } } closing brace 7E 126 ~ ~ tilde 7F 127 DEL -
On most systems there is also an additional set of 128 "extended ASCII codes" that are used to represent a variety of other symbols but are not part of the ASCII standard.
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