ASCII Encoding Standards

ASCII Character Set

The ASCII character set includes standard characters such as letters, numbers, punctuation, and control characters. Each character is assigned a unique seven-bit binary code.

Decimal	Character	Description
0	NUL	Null
1	SOH	Start of Header
2	STX	Start of Text
3	ETX	End of Text
4	EOT	End of Transmit
5	ENQ	Enquiry
6	ACK	Acknowledge
7	BEL	Bell
8	BS	Backspace
9	HT	Horizontal Tab
10	LF	Line Feed
11	VT	Vertical Tab
12	FF	Form Feed
13	CR	Carriage Return
14	SO	Shift Out
15	SI	Shift In
…	…	…
32	(space)	Space
33	!	Exclamation Mark
34	“	Quotation Mark
…	…	…
65	A	Uppercase A
66	B	Uppercase B
…	…	…
97	a	Lowercase a
98	b	Lowercase b
…	…	…
127	DEL	Delete

ASCII Control Characters

In addition to printable characters, ASCII includes control characters for formatting and controlling devices. These include characters like carriage return and line feed.

Decimal	Character	Description
0	NUL	Null
1	SOH	Start of Header
2	STX	Start of Text
3	ETX	End of Text
4	EOT	End of Transmit
5	ENQ	Enquiry
6	ACK	Acknowledge
7	BEL	Bell
8	BS	Backspace
9	HT	Horizontal Tab
10	LF	Line Feed
11	VT	Vertical Tab
12	FF	Form Feed
13	CR	Carriage Return
14	SO	Shift Out
15	SI	Shift In

ASCII Extended Characters

While the original ASCII set comprises 128 characters, extended ASCII introduces an additional 128 characters, accommodating symbols and characters for different languages.

Decimal	Character	Description
128	Ç	Latin Capital Letter C-cedilla
129	ü	Latin Small Letter U with Diaeresis
130	é	Latin Small Letter E with Acute
131	â	Latin Small Letter A with Circumflex
132	ä	Latin Small Letter A with Diaeresis
133	à	Latin Small Letter A with Grave
134	å	Latin Small Letter A with Ring Above
…	…	…
255	ÿ	Latin Small Letter Y with Diaeresis

ASCII Table

A comprehensive ASCII table organizes characters and their corresponding binary, decimal, and hexadecimal representations.

Decimal	Hex	Binary	Character	Description
0	00	00000000	NUL	Null
1	01	00000001	SOH	Start of Header
2	02	00000010	STX	Start of Text
3	03	00000011	ETX	End of Text
4	04	00000100	EOT	End of Transmit
5	05	00000101	ENQ	Enquiry
6	06	00000110	ACK	Acknowledge
7	07	00000111	BEL	Bell
8	08	00001000	BS	Backspace
9	09	00001001	HT	Horizontal Tab
10	0A	00001010	LF	Line Feed
11	0B	00001011	VT	Vertical Tab
12	0C	00001100	FF	Form Feed
13	0D	00001101	CR	Carriage Return
14	0E	00001110	SO	Shift Out
15	0F	00001111	SI	Shift In
16	10	00010000	DLE	Data Link Escape
17	11	00010001	DC1	Device Control 1 (oft. XON)
18	12	00010010	DC2	Device Control 2
19	13	00010011	DC3	Device Control 3 (oft. XOFF)
20	14	00010100	DC4	Device Control 4
21	15	00010101	NAK	Negative Acknowledge
22	16	00010110	SYN	Synchronous Idle
23	17	00010111	ETB	End of Transmission Block
24	18	00011000	CAN	Cancel
25	19	00011001	EM	End of Medium
26	1A	00011010	SUB	Substitute
27	1B	00011011	ESC	Escape
28	1C	00011100	FS	File Separator
29	1D	00011101	GS	Group Separator
30	1E	00011110	RS	Record Separator
31	1F	00011111	US	Unit Separator
32	20	00100000	(space)	Space
33	21	00100001	!	Exclamation Mark
34	22	00100010	“	Quotation Mark
35	23	00100011	#	Number Sign
36	24	00100100	$	Dollar Sign
37	25	00100101	%	Percent Sign
38	26	00100110	&	Ampersand
39	27	00100111	‘	Apostrophe (Single Quote)
40	28	00101000	(	Left Parenthesis
41	29	00101001	)	Right Parenthesis
42	2A	00101010	*	Asterisk
43	2B	00101011	+	Plus Sign
44	2C	00101100	,	Comma
45	2D	00101101	–	Hyphen (Minus Sign)
46	2E	00101110	.	Period (Full Stop)
47	2F	00101111	/	Solidus (Slash)
48	30	00110000	0	Digit Zero
49	31	00110001	1	Digit One
50	32	00110010	2	Digit Two
51	33	00110011	3	Digit Three
52	34	00110100	4	Digit Four
53	35	00110101	5	Digit Five
54	36	00110110	6	Digit Six
55	37	00110111	7	Digit Seven
56	38	00111000	8	Digit Eight
57	39	00111001	9	Digit Nine
58	3A	00111010	:	Colon
59	3B	00111011	;	Semicolon
60	3C	00111100	<	Less Than (Angle Bracket, Left Pointing)
61	3D	00111101	=	Equals Sign
62	3E	00111110	>	Greater Than (Angle Bracket, Right Pointing)
63	3F	00111111	?	Question Mark
64	40	01000000	@	At Sign
65	41	01000001	A	Uppercase A
66	42	01000010	B	Uppercase B
67	43	01000011	C	Uppercase C
68	44	01000100	D	Uppercase D
69	45	01000101	E	Uppercase E
70	46	01000110	F	Uppercase F
71	47	01000111	G	Uppercase G
72	48	01001000	H	Uppercase H
73	49	01001001	I	Uppercase I
74	4A	01001010	J	Uppercase J
75	4B	01001011	K	Uppercase K
76	4C	01001100	L	Uppercase L
77	4D	01001101	M	Uppercase M
78	4E	01001110	N	Uppercase N
79	4F	01001111	O	Uppercase O
80	50	01010000	P	Uppercase P
81	51	01010001	Q	Uppercase Q
82	52	01010010	R	Uppercase R
83	53	01010011	S	Uppercase S
84	54	01010100	T	Uppercase T
85	55	01010101	U	Uppercase U
86	56	01010110	V	Uppercase V
87	57	01010111	W	Uppercase W
88	58	01011000	X	Uppercase X
89	59	01011001	Y	Uppercase Y
90	5A	01011010	Z	Uppercase Z
91	5B	01011011	[	Left Square Bracket
92	5C	01011100	\	Backslash
93	5D	01011101	]	Right Square Bracket
94	5E	01011110	^	Caret (Circumflex Accent)
95	5F	01011111	_	Underscore
96	60	01100000	`	Grave Accent
97	61	01100001	a	Lowercase a
98	62	01100010	b	Lowercase b
99	63	01100011	c	Lowercase c
100	64	01100100	d	Lowercase d
101	65	01100101	e	Lowercase e
102	66	01100110	f	Lowercase f
103	67	01100111	g	Lowercase g
104	68	01101000	h	Lowercase h
105	69	01101001	i	Lowercase i
106	6A	01101010	j	Lowercase j
107	6B	01101011	k	Lowercase k
108	6C	01101100	l	Lowercase l
109	6D	01101101	m	Lowercase m
110	6E	01101110	n	Lowercase n
111	6F	01101111	o	Lowercase o
112	70	01110000	p	Lowercase p
113	71	01110001	q	Lowercase q
114	72	01110010	r	Lowercase r
115	73	01110011	s	Lowercase s
116	74	01110100	t	Lowercase t
117	75	01110101	u	Lowercase u
118	76	01110110	v	Lowercase v
119	77	01110111	w	Lowercase w
120	78	01111000	x	Lowercase x
121	79	01111001	y	Lowercase y
122	7A	01111010	z	Lowercase z
123	7B	01111011	{	Left Curly Brace
124	7C	01111100	\|	Vertical Bar
125	7D	01111101	}	Right Curly Brace
126	7E	01111110	~	Tilde
127	7F	01111111	DEL	Delete

What is ASCII – A Complete Guide to Generating ASCII Code

The American Standard Code for Information Interchange, or ASCII, is a character encoding standard that has been a foundational element in computing for decades. It plays a crucial role in representing text and control characters in digital form.

Historical Background

ASCII has a rich history, dating back to its development in the early 1960s. Originating from telegraph code and Morse code, ASCII emerged as a standardized way to represent characters in computers, facilitating data interchange.

Importance in Computing

ASCII’s significance in computing lies in its universality. It provides a standardized method for encoding characters, allowing seamless communication and data exchange across diverse computing systems.

Table of Content

ASCII Encoding Standards
ASCII Representation
ASCII in Computing
ASCII Extended Sets
ASCII vs. Unicode
Practical Examples of ASCII
Limitations of ASCII
Handling Non-ASCII Characters