ASCII ist eine 7bit - Zeichenkodierung für die EDV und steht für American Standard Code for Information Interchange! Diese Kodierung definiert 128 Zeichen, die aus 33 nicht darstellbaren / druckbaren und 95 darstellbaren / druckbaren Zeichen besteht. So ist beispielsweise das Zeichen AT: '@' als ASCII kodiert der Wert 65. Jedes ASCII Zeichen kann über die Computertastatur und Nummernblock (rechts) eingegeben werden. Finden sie beispielsweise das AT-Zeichen '@' nicht auf ihrer Tastatur, so können sie die ALT-Taste drücken (gedrückt halten) und rechts am Ziffernblock den ASCII - Code (hier: 65) tippen und die ALT-Taste wieder loslassen. Anschließend wird das AT-Zeichen ausgegeben. Das geht mit jedem Zeichen.
| Decimal | Hex | Char | HTML | Bedeutung |
| 0 | 0x00 | NUL | - | null |
| 1 | 0x01 | SOH | - | start of heading |
| 2 | 0x02 | STX | - | start of text |
| 3 | 0x03 | ETX | - | end of text |
| 4 | 0x04 | EOT | - | end of transmission |
| 5 | 0x05 | ENQ | - | enquiry |
| 6 | 0x06 | ACK | - | acknowledge |
| 7 | 0x07 | BEL | - | bell |
| 8 | 0x08 | BS | - | backspace |
| 9 | 0x09 | TAB | - | horizontal tab |
| 10 | 0x0A | LF | - | linefeed |
| 11 | 0x0B | VT | - | vertical tab |
| 12 | 0x0C | FF | - | formfeed |
| 13 | 0x0D | CR | - | carriage return |
| 14 | 0x0E | SO | - | shift out |
| 15 | 0x0F | SI | - | shift in |
| 16 | 0x10 | DLE | - | data link escape |
| 17 | 0x11 | DC1 | - | device control 1 |
| 18 | 0x12 | DC2 | - | device control 2 |
| 19 | 0x13 | DC3 | - | device control 3 |
| 20 | 0x14 | DC4 | - | device control 4 |
| 21 | 0x15 | NAK | - | negative acknowledge |
| 22 | 0x16 | SYN | - | synchronous idle |
| 23 | 0x17 | ETB | - | end of transsmission |
| 24 | 0x18 | CAN | - | cancel |
| 25 | 0x19 | EM | - | end of medium |
| 26 | 0x1A | SUB | - | substitute |
| 27 | 0x1B | ESC | - | escape |
| 28 | 0x1C | FS | - | file seperator |
| 29 | 0x1D | GS | - | group seperator |
| 30 | 0x1E | RS | - | record seperator |
| 31 | 0x1F | US | - | unite seperator |
| 32 | 0x20 | SPACE |   | - |
| 33 | 0x21 | ! | ! | - |
| 34 | 0x22 | " | " | - |
| 35 | 0x23 | # | # | - |
| 36 | 0x24 | $ | $ | - |
| 37 | 0x25 | % | % | - |
| 38 | 0x26 | & | & | - |
| 39 | 0x27 | ' | ' | - |
| 40 | 0x28 | ( | ( | - |
| 41 | 0x29 | ) | ) | - |
| 42 | 0x2A | * | * | - |
| 43 | 0x2B | + | + | - |
| 44 | 0x2C | , | , | - |
| 45 | 0x2D | - | - | - |
| 46 | 0x2E | . | . | - |
| 47 | 0x2F | / | / | - |
| 48 | 0x30 | 0 | 0 | - |
| 49 | 0x31 | 1 | 1 | - |
| 50 | 0x32 | 2 | 2 | - |
| 51 | 0x33 | 3 | 3 | - |
| 52 | 0x34 | 4 | 4 | - |
| 53 | 0x35 | 5 | 5 | - |
| 54 | 0x36 | 6 | 6 | - |
| 55 | 0x37 | 7 | 7 | - |
| 56 | 0x38 | 8 | 8 | - |
| 57 | 0x39 | 9 | 9 | - |
| 58 | 0x3A | : | : | - |
| 59 | 0x3B | ; | ; | - |
| 60 | 0x3C | < | < | - |
| 61 | 0x3D | = | = | - |
| 62 | 0x3E | > | > | - |
| 63 | 0x3F | ? | ? | - |
| 64 | 0x40 | @ | @ | - |
| 65 | 0x41 | A | A | - |
| 66 | 0x42 | B | B | - |
| 67 | 0x43 | C | C | - |
| 68 | 0x44 | D | D | - |
| 69 | 0x45 | E | E | - |
| 70 | 0x46 | F | F | - |
| 71 | 0x47 | G | G | - |
| 72 | 0x48 | H | H | - |
| 73 | 0x49 | I | I | - |
| 74 | 0x4A | J | J | - |
| 75 | 0x4B | K | K | - |
| 76 | 0x4C | L | L | - |
| 77 | 0x4D | M | M | - |
| 78 | 0x4E | N | N | - |
| 79 | 0x4F | O | O | - |
| 80 | 0x50 | P | P | - |
| 81 | 0x51 | Q | Q | - |
| 82 | 0x52 | R | R | - |
| 83 | 0x53 | S | S | - |
| 84 | 0x54 | T | T | - |
| 85 | 0x55 | U | U | - |
| 86 | 0x56 | V | V | - |
| 87 | 0x57 | W | W | - |
| 88 | 0x58 | X | X | - |
| 89 | 0x59 | Y | Y | - |
| 90 | 0x5A | Z | Z | - |
| 91 | 0x5B | [ | [ | - |
| 92 | 0x5C | \ | \ | - |
| 93 | 0x5D | ] | ] | - |
| 94 | 0x5E | ^ | ^ | - |
| 95 | 0x5F | _ | _ | - |
| 96 | 0x60 | ` | ` | - |
| 97 | 0x61 | a | a | - |
| 98 | 0x62 | b | b | - |
| 99 | 0x63 | c | c | - |
| 100 | 0x64 | d | d | - |
| 101 | 0x65 | e | e | - |
| 102 | 0x66 | f | f | - |
| 103 | 0x67 | g | g | - |
| 104 | 0x68 | h | h | - |
| 105 | 0x69 | i | i | - |
| 106 | 0x6A | j | j | - |
| 107 | 0x6B | k | k | - |
| 108 | 0x6C | l | l | - |
| 109 | 0x6D | m | m | - |
| 110 | 0x6E | n | n | - |
| 111 | 0x6F | o | o | - |
| 112 | 0x70 | p | p | - |
| 113 | 0x71 | q | q | - |
| 114 | 0x72 | r | r | - |
| 115 | 0x73 | s | s | - |
| 116 | 0x74 | t | t | - |
| 117 | 0x75 | u | u | - |
| 118 | 0x76 | v | v | - |
| 119 | 0x77 | w | w | - |
| 120 | 0x78 | x | x | - |
| 121 | 0x79 | y | y | - |
| 122 | 0x7A | z | z | - |
| 123 | 0x7B | { | { | - |
| 124 | 0x7C | | | | | - |
| 125 | 0x7D | } | } | - |
| 126 | 0x7E | ~ | ~ | - |
| 127 | 0x7F | ¦ |  | - |
ASCII - Extended
| Decimal | Hex | Char |
| 128 | 0x80 | Ç |
| 129 | 0x81 | |
| 130 | 0x82 | é |
| 131 | 0x83 | â |
| 132 | 0x84 | ä |
| 133 | 0x85 | à |
| 134 | 0x86 | å |
| 135 | 0x87 | ç |
| 136 | 0x88 | ê |
| 137 | 0x89 | ë |
| 138 | 0x8A | è |
| 139 | 0x8B | ï |
| 140 | 0x8C | î |
| 141 | 0x8D | ì |
| 142 | 0x8E | Ä |
| 143 | 0x8F | Å |
| 144 | 0x90 | É |
| 145 | 0x91 | æ |
| 146 | 0x92 | Æ |
| 147 | 0x93 | ô |
| 148 | 0x94 | ö |
| 149 | 0x95 | ò |
| 150 | 0x96 | û |
| 151 | 0x97 | ù |
| 152 | 0x98 | ÿ |
| 153 | 0x99 | Ö |
| 154 | 0x9A | Ü |
| 155 | 0x9B | ø |
| 156 | 0x9C | £ |
| 157 | 0x9D | Ø |
| 158 | 0x9E | × |
| 159 | 0x9F | ƒ |
| 160 | 0xA0 | á |
| 161 | 0xA1 | í |
| 162 | 0xA2 | ó |
| 163 | 0xA3 | ú |
| 164 | 0xA4 | ñ |
| 165 | 0xA5 | Ñ |
| 166 | 0xA6 | ª |
| 167 | 0xA7 | º |
| 168 | 0xA8 | ¿ |
| 169 | 0xA9 | ® |
| 170 | 0xAA | ¬ |
| 171 | 0xAB | ½ |
| 172 | 0xAC | ¼ |
| 173 | 0xAD | ¡ |
| 174 | 0xAE | « |
| 175 | 0xAF | » |
| 176 | 0xB0 | ¦ |
| 177 | 0xB1 | ¦ |
| 178 | 0xB2 | ¦ |
| 179 | 0xB3 | ¦ |
| 180 | 0xB4 | ¦ |
| 181 | 0xB5 | Á |
| 182 | 0xB6 | Â |
| 183 | 0xB7 | À |
| 184 | 0xB8 | © |
| 185 | 0xB9 | ¦ |
| 186 | 0xBA | ¦ |
| 187 | 0xBB | + |
| 188 | 0xBC | + |
| 189 | 0xBD | ¢ |
| 190 | 0xBE | ¥ |
| 191 | 0xBF | + |
| 192 | 0xC0 | + |
| 193 | 0xC1 | - |
| 194 | 0xC2 | - |
| 195 | 0xC3 | + |
| 196 | 0xC4 | - |
| 197 | 0xC5 | + |
| 198 | 0xC6 | ã |
| 199 | 0xC7 | Ã |
| 200 | 0xC8 | + |
| 201 | 0xC9 | + |
| 202 | 0xCA | - |
| 203 | 0xCB | - |
| 204 | 0xCC | ¦ |
| 205 | 0xCD | - |
| 206 | 0xCE | + |
| 207 | 0xCF | ¤ |
| 208 | 0xD0 | ð |
| 209 | 0xD1 | Ð |
| 210 | 0xD2 | Ê |
| 211 | 0xD3 | Ë |
| 212 | 0xD4 | È |
| 213 | 0xD5 | i |
| 214 | 0xD6 | Í |
| 215 | 0xD7 | Î |
| 216 | 0xD8 | Ï |
| 217 | 0xD9 | + |
| 218 | 0xDA | + |
| 219 | 0xDB | ¦ |
| 220 | 0xDC | _ |
| 221 | 0xDD | ¦ |
| 222 | 0xDE | Ì |
| 223 | 0xDF | ¯ |
| 224 | 0xE0 | Ó |
| 225 | 0xE1 | ß |
| 226 | 0xE2 | Ô |
| 227 | 0xE3 | Ò |
| 228 | 0xE4 | õ |
| 229 | 0xE5 | Õ |
| 230 | 0xE6 | µ |
| 231 | 0xE7 | þ |
| 232 | 0xE8 | Þ |
| 233 | 0xE9 | Ú |
| 234 | 0xEA | Û |
| 235 | 0xEB | Ù |
| 236 | 0xEC | ý |
| 237 | 0xED | Ý |
| 238 | 0xEE | ¯ |
| 239 | 0xEF | ´ |
| 240 | 0xF0 | |
| 241 | 0xF1 | ± |
| 242 | 0xF2 | = |
| 243 | 0xF3 | ¾ |
| 244 | 0xF4 | ¶ |
| 245 | 0xF5 | § |
| 246 | 0xF6 | ÷ |
| 247 | 0xF7 | ¸ |
| 248 | 0xF8 | ° |
| 249 | 0xF9 | ¨ |
| 250 | 0xFA | · |
| 251 | 0xFB | ¹ |
| 252 | 0xFC | ³ |
| 253 | 0xFD | ² |
| 254 | 0xFE | ¦ |
| 255 | 0xFF |
| Decimal | Hex | Char |
| 00, 30 | 0x00, 0x1E | ALT - A |
| 00, 48 | 0x00, 0x30 | ALT - B |
| 00, 46 | 0x00, 0x2E | ALT - C |
| 00, 32 | 0x00, 0x20 | ALT - D |
| 00, 18 | 0x00, 0x12 | ALT - E |
| 00, 33 | 0x00, 0x21 | ALT - F |
| 00, 34 | 0x00, 0x22 | ALT - D |
| 00, 35 | 0x00, 0x23 | ALT - H |
| 00, 23 | 0x00, 0x17 | ALT - I |
| 00, 36 | 0x00, 0x24 | ALT - J |
| 00, 37 | 0x00, 0x25 | ALT - K |
| 00, 38 | 0x00, 0x26 | ALT - L |
| 00, 50 | 0x00, 0x32 | ALT - M |
| 00, 49 | 0x00, 0x31 | ALT - N |
| 00, 24 | 0x00, 0x18 | ALT - O |
| 00, 25 | 0x00, 0x19 | ALT - P |
| 00, 16 | 0x00, 0x10 | ALT - Q |
| 00, 19 | 0x00, 0x13 | ALT - R |
| 00, 31 | 0x00, 0x1A | ALT - S |
| 00, 20 | 0x00, 0x14 | ALT - T |
| 00, 22 | 0x00, 0x16 | ALT - U |
| 00, 47 | 0x00, 0x2F | ALT - V |
| 00, 17 | 0x00, 0x11 | ALT - W |
| 00, 45 | 0x00, 0x2D | ALT - X |
| 00, 21 | 0x00, 0x15 | ALT - Y |
| 00, 44 | 0x00, 0x2C | ALT - Z |
| 00, 73 | 0x00, 0x49 | PgUp |
| 00, 81 | 0x00, 0x51 | PgDown |
| 00, 71 | 0x00, 0x47 | Home |
| 00, 79 | 0x00, 0x4F | End |
| 00, 72 | 0x00, 0x48 | UpArrow |
| 00, 80 | 0x00, 0x50 | DownArrow |
| 00, 75 | 0x00, 0x4B | LeftArrow |
| 00, 77 | 0x00, 0x4D | RightArrow |
| 00, 59 | 0x00, 0x3B | F1 |
| 00, 60 | 0x00, 0x3C | F2 |
| 00, 61 | 0x00, 0x3D | F3 |
| 00, 62 | 0x00, 0x3E | F4 |
| 00, 63 | 0x00, 0x3F | F5 |
| 00, 64 | 0x00, 0x40 | F6 |
| 00, 65 | 0x00, 0x41 | F7 |
| 00, 66 | 0x00, 0x42 | F8 |
| 00, 67 | 0x00, 0x43 | F9 |
| 00, 68 | 0x00, 0x44 | F10 |
| 00, 133 | 0x00, 0x85 | F11 |
| 00, 134 | 0x00, 0x86 | F12 |
| 00, 104 | 0x00, 0x68 | ALT - F1 |
| 00, 105 | 0x00, 0x69 | ALT - F2 |
| 00, 106 | 0x00, 0x6A | ALT - F3 |
| 00, 107 | 0x00, 0x6B | ALT - F4 |
| 00, 108 | 0x00, 0x6C | ALT - F5 |
| 00, 109 | 0x00, 0x6D | ALT - F6 |
| 00, 110 | 0x00, 0x6E | ALT - F7 |
| 00, 111 | 0x00, 0x6F | ALT - F8 |
| 00, 112 | 0x00, 0x70 | ALT - F9 |
| 00, 113 | 0x00, 0x71 | ALT - F10 |
| 00, 139 | 0x00, 0x8B | ALT - F11 |
| 00, 140 | 0x00, 0x8C | ALT - F12 |