De standaard ASCII (American Standard Code for Information Interchange) teken reeks is een 7 bits karakter set. Het bevat de standaard karakters, zoals gebruikt op een natieve ASCII machine zoals Windows, Unix, VMS/VAX, etc...
Het bevat de tekens 0 tot 127 (decimaal), welke overeen komen met de binaire waarden 00000000 tot 01111111.
De uitgebreide of verlengde ASCII karakter set, of 8 bits set, bevat de standaard tekens 0 tot 127 (decimaal) en de speciale tekens, 128 tot 255. Tekens opgenomen in de 8 bits karakter set of tabel kunnen verschillend zijn in ieder land; zij bevatten de land-eigen tekens zoals in Frankrijk é, ù, è, à etc...
De eerste 32 tekens zijn Controle karakters of worden ook wel non-printable karakters genoemd
| Decimaal | Hex | Binaire | Waarde | Uitleg |
| 000 | 00 | 00000000 | NUL | NULL Karakter |
| 001 | 01 | 00000001 | SOH | Start of Header |
| 002 | 02 | 00000010 | STX | Start of Text |
| 003 | 03 | 00000011 | ETX | End of Text |
| 004 | 04 | 00000100 | EOT | End of Transmission |
| 005 | 05 | 00000101 | ENQ | Enquiry |
| 006 | 06 | 00000110 | ACK | Acknowledgement |
| 007 | 07 | 00000111 | BEL | Bell |
| 008 | 08 | 00001000 | BS | Backspace |
| 009 | 09 | 00001001 | HT | Horizontale Tab |
| 010 | 0A | 00001010 | LF | Line Feed |
| 011 | 0B | 00001011 | VT | Verticale Tab |
| 012 | 0C | 00001100 | FF | Form Feed |
| 013 | 0D | 00001101 | CR | Carriage Return |
| 014 | 0E | 00001110 | SO | Shift Out |
| 015 | 0F | 00001111 | SI | Shift In |
| 016 | 10 | 00010000 | DLE | Data Link Escape |
| 017 | 11 | 00010001 | DC1 | Device Control 1 (XON) |
| 018 | 12 | 00010010 | DC2 | Device Control 2 |
| 019 | 13 | 00010011 | DC3 | Device Control 3 (XOFF) |
| 020 | 14 | 00010100 | DC4 | Device Control 4 |
| 021 | 15 | 00010101 | NAK | Negatieve Acknowledgement |
| 022 | 16 | 00010110 | SYN | Synchronous Idle |
| 023 | 17 | 00010111 | ETB | End of Transmission Block |
| 024 | 18 | 00011000 | CAN | Cancel |
| 025 | 19 | 00011001 | EM | End of Medium |
| 026 | 1A | 00011010 | SUB | Substitude |
| 027 | 1B | 00011011 | ESC | Escape |
| 028 | 1C | 00011100 | FS | File Separator |
| 029 | 1D | 00011101 | GS | Group Separator |
| 030 | 1E | 00011110 | RS | Record Separator / Request to Send |
| 031 | 1F | 00011111 | US | Unit Separator |
| 032 | 20 | 00100000 | SP | Spatie |
| 033 | 21 | 00100001 | ! | uitroep teken |
| 034 | 22 | 00100010 | " | Dubbele quote |
| 035 | 23 | 00100011 | # | Number sign / hekje |
| 036 | 24 | 00100100 | $ | Dollar teken |
| 037 | 25 | 00100101 | % | Percent |
| 038 | 26 | 00100110 | & | Ampersand |
| 039 | 27 | 00100111 | ' | Enkele quote |
| 040 | 28 | 00101000 | ( | Linker parenthesis / Openende parenthesis |
| 041 | 29 | 00101001 | ) | Rechter parenthesis / Sluitende parenthesis |
| 042 | 2A | 00101010 | * | Asterisk |
| 043 | 2B | 00101011 | + | Plus |
| 044 | 2C | 00101100 | , | Komma |
| 045 | 2D | 00101101 | - | Min / Dash |
| 046 | 2E | 00101110 | . | Punt |
| 047 | 2F | 00101111 | / | Voorwaardse slash |
| 048 | 30 | 00110000 | 0 | |
| 049 | 31 | 00110001 | 1 | |
| 050 | 32 | 00110010 | 2 | |
| 051 | 33 | 00110011 | 3 | |
| 052 | 34 | 00110100 | 4 | |
| 053 | 35 | 00110101 | 5 | |
| 054 | 36 | 00110110 | 6 | |
| 055 | 37 | 00110111 | 7 | |
| 056 | 38 | 00111000 | 8 | |
| 057 | 39 | 00111001 | 9 | |
| 058 | 3A | 00111010 | : | Colon |
| 059 | 3B | 00111011 | ; | Semi-colon |
| 060 | 3C | 00111100 | < | Minder dan |
| 061 | 3D | 00111101 | = | Is gelijk |
| 062 | 3E | 00111110 | > | Groter dan |
| 063 | 3F | 00111111 | ? | Vraagteken |
| 064 | 40 | 01000000 | @ | AT / Apestaartje |
| 065 | 41 | 01000001 | A | |
| 066 | 42 | 01000010 | B | |
| 067 | 43 | 01000011 | C | |
| 068 | 44 | 01000100 | D | |
| 069 | 45 | 01000101 | E | |
| 070 | 46 | 01000110 | F | |
| 071 | 47 | 01000111 | G | |
| 072 | 48 | 01001000 | H | |
| 073 | 49 | 01001001 | I | |
| 074 | 4A | 01001010 | J | |
| 075 | 4B | 01001011 | K | |
| 076 | 4C | 01001100 | L | |
| 077 | 4D | 01001101 | M | |
| 078 | 4E | 01001110 | N | |
| 079 | 4F | 01001111 | O | |
| 080 | 50 | 01010000 | P | |
| 081 | 51 | 01010001 | Q | |
| 082 | 52 | 01010010 | R | |
| 083 | 53 | 01010011 | S | |
| 084 | 54 | 01010100 | T | |
| 085 | 55 | 01010101 | U | |
| 086 | 56 | 01010110 | V | |
| 087 | 57 | 01010111 | W | |
| 088 | 58 | 01011000 | X | |
| 089 | 59 | 01011001 | Y | |
| 090 | 5A | 01011010 | Z | |
| 091 | 5B | 01011011 | [ | Linker bracket / Openende bracket |
| 092 | 5C | 01011100 | \ | Back slash |
| 093 | 5D | 01011101 | ] | Rechter bracket / Sluitende bracket |
| 094 | 5E | 01011110 | ^ | Caret / Circumflex |
| 095 | 5F | 01011111 | _ | Underscore |
| 096 | 60 | 01100000 | ` | Back quote |
| 097 | 61 | 01100001 | a | |
| 098 | 62 | 01100010 | b | |
| 099 | 63 | 01100011 | c | |
| 100 | 64 | 01100100 | d | |
| 101 | 65 | 01100101 | e | |
| 102 | 66 | 01100110 | f | |
| 103 | 67 | 01100111 | g | |
| 104 | 68 | 01101000 | h | |
| 105 | 69 | 01101001 | i | |
| 106 | 6A | 01101010 | j | |
| 107 | 6B | 01101011 | k | |
| 108 | 6C | 01101100 | l | |
| 109 | 6D | 01101101 | m | |
| 110 | 6E | 01101110 | n | |
| 111 | 6F | 01101111 | o | |
| 112 | 70 | 01110000 | p | |
| 113 | 71 | 01110001 | q | |
| 114 | 72 | 01110010 | r | |
| 115 | 73 | 01110011 | s | |
| 116 | 74 | 01110100 | t | |
| 117 | 75 | 01110101 | u | |
| 118 | 76 | 01110110 | v | |
| 119 | 77 | 01110111 | w | |
| 120 | 78 | 01111000 | x | |
| 121 | 79 | 01111001 | y | |
| 122 | 7A | 01111010 | z | |
| 123 | 7B | 01111011 | { | Linker brace / Openende brace |
| 124 | 7C | 01111100 | | | Verticale bar |
| 125 | 7D | 01111101 | } | Rechter brace / Sluitende brace |
| 126 | 7E | 01111110 | ~ | Tilde |
| 127 | 7F | 01111111 | DEL | Delete |