HTML ASCII

ASCII stands for American Standard Code for Information Interchange. ASCII was the first character encoding standard (Charset) used in computing.  This standard was created in the 60‘s and has been fundamental to the field of computing.

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ASCII represents 127 characters, which include: numbers from 0-9, the upper and lower case letters from A-Z, and some special characters.

Example

ASCII maps the value of 54 to the number 6, 102 to the letter f, and 43 to a plus sign.

6 f +

<p style="font-size:100px;">&#54; &#102; &#43; </p>

Next, we'll review all 128 numbers and their equivalent ASCII characters.
They are grouped in printable (visible) characters and control (non-visible) characters.

ASCII Printable Characters

ASCII codes 32-126 are the printable characters (i.e. character that you can see).

These represent letters, numbers, punctuation marks, and some other symbols.

These codes are a very close match to the characters on your keyboard.

This table lists the ASCII printable characters with their corresponding number and description.

Character Number Description
  32 space
! 33 exclamation mark
" 34 quotation mark
# 35 number sign
$ 36 dollar sign
% 37 percent sign
& 38 ampersand
' 39 apostrophe
( 40 left parenthesis
) 41 right parenthesis
* 42 asterisk
+ 43 plus sign
, 44 comma
- 45 hyphen
. 46 period
/ 47 slash
0 48 number 0
1 49 number 1
2 50 number 2
3 51 number 3
4 52 number 4
5 53 number 5
6 54 number 6
7 55 number 7
8 56 number 8
9 57 number 9
: 58 colon
; 59 semicolon
< 60 less-than
= 61 equals-to
> 62 greater-than
? 63 question mark
@ 64 at sign
A 65 uppercase a
B 66 uppercase b
C 67 uppercase c
D 68 uppercase d
E 69 uppercase e
F 70 uppercase f
G 71 uppercase g
H 72 uppercase h
I 73 uppercase i
J 74 uppercase j
K 75 uppercase k
L 76 uppercase l
M 77 uppercase m
N 78 uppercase n
O 79 uppercase o
P 80 uppercase p
Q 81 uppercase q
R 82 uppercase r
S 83 uppercase s
T 84 uppercase t
U 85 uppercase u
V 86 uppercase v
W 87 uppercase w
X 88 uppercase x
Y 89 uppercase y
Z 90 uppercase z
[ 91 left square bracket
\ 92 backslash
] 93 right square bracket
^ 94 caret
_ 95 underscore
` 96 grave accent
a 97 lowercase a
b 98 lowercase b
c 99 lowercase c
d 100 lowercase d
e 101 lowercase e
f 102 lowercase f
g 103 lowercase g
h 104 lowercase h
i 105 lowercase i
j 106 lowercase j
k 107 lowercase k
l 108 lowercase l
m 109 lowercase m
n 110 lowercase n
o 111 lowercase o
p 112 lowercase p
q 113 lowercase q
r 114 lowercase r
s 115 lowercase s
t 116 lowercase t
u 117 lowercase u
v 118 lowercase v
w 119 lowercase w
x 120 lowercase x
y 121 lowercase y
z 122 lowercase z
{ 123 left curly brace
| 124 vertical bar
} 125 right curly brace
~ 126 tilde

ASCII Control Characters

The first 32 characters and last character in the ASCII-table are unprintable control codes.

These are used to control peripheral devices, such as printers.

This table lists the ASCII control characters with their corresponding number and description.

Character Number Description
NUL 00 null character
SOH 01 start of header
STX 02 start of text
ETX 03 end of text
EOT 04 end of transmission
ENQ 05 enquiry
ACK 06 acknowledge
BEL 07 bell (ring)
BS 08 backspace
HT 09 horizontal tab
LF 10 line feed
VT 11 vertical tab
FF 12 form feed
CR 13 carriage return
SO 14 shift out
SI 15 shift in
DLE 16 data link escape
DC1 17 device control 1
DC2 18 device control 2
DC3 19 device control 3
DC4 20 device control 4
NAK 21 negative acknowledge
SYN 22 synchronize
ETB 23 end transmission block
CAN 24 cancel
EM 25 end of medium
SUB 26 substitute
ESC 27 escape
FS 28 file separator
GS 29 group separator
RS 30 record separator
US 31 unit separator
DEL 127 delete (rubout)

Note:  Several of the control characters have their origin in typewriters. For example: Backspace, Linefeed, Carriage Return, Shift In, Shift Out, and Bell.  In the early days of computing, printers worked just like typewriters.


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