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Dec	Hex	Oct	Char	Description
0	0x00	000	NUL	Null
1	0x01	001	SOH	Start of Heading
2	0x02	002	STX	Start of Text
3	0x03	003	ETX	End of Text
4	0x04	004	EOT	End of Transmission
5	0x05	005	ENQ	Enquiry
6	0x06	006	ACK	Acknowledge
7	0x07	007	BEL	Bell
8	0x08	010	BS	Backspace
9	0x09	011	HT	Horizontal Tab
10	0x0A	012	LF	Line Feed
11	0x0B	013	VT	Vertical Tab
12	0x0C	014	FF	Form Feed
13	0x0D	015	CR	Carriage Return
14	0x0E	016	SO	Shift Out
15	0x0F	017	SI	Shift In
16	0x10	020	DLE	Data Link Escape
17	0x11	021	DC1	Device Control 1
18	0x12	022	DC2	Device Control 2
19	0x13	023	DC3	Device Control 3
20	0x14	024	DC4	Device Control 4
21	0x15	025	NAK	Negative Acknowledge
22	0x16	026	SYN	Synchronous Idle
23	0x17	027	ETB	End of Trans. Block
24	0x18	030	CAN	Cancel
25	0x19	031	EM	End of Medium
26	0x1A	032	SUB	Substitute
27	0x1B	033	ESC	Escape
28	0x1C	034	FS	File Separator
29	0x1D	035	GS	Group Separator
30	0x1E	036	RS	Record Separator
31	0x1F	037	US	Unit Separator
32	0x20	040	SP	Space
33	0x21	041	!	Exclamation mark
34	0x22	042	"	Double quote
35	0x23	043	#	Hash / Number sign
36	0x24	044	$	Dollar sign
37	0x25	045	%	Percent sign
38	0x26	046	&	Ampersand
39	0x27	047	'	Single quote
40	0x28	050	(	Left parenthesis
41	0x29	051	)	Right parenthesis
42	0x2A	052	*	Asterisk
43	0x2B	053	+	Plus sign
44	0x2C	054	,	Comma
45	0x2D	055	-	Hyphen / Minus
46	0x2E	056	.	Period / Full stop
47	0x2F	057	/	Slash
48	0x30	060	0	Digit 0
49	0x31	061	1	Digit 1
50	0x32	062	2	Digit 2
51	0x33	063	3	Digit 3
52	0x34	064	4	Digit 4
53	0x35	065	5	Digit 5
54	0x36	066	6	Digit 6
55	0x37	067	7	Digit 7
56	0x38	070	8	Digit 8
57	0x39	071	9	Digit 9
58	0x3A	072	:	Colon
59	0x3B	073	;	Semicolon
60	0x3C	074	<	Less than
61	0x3D	075	=	Equals sign
62	0x3E	076	>	Greater than
63	0x3F	077	?	Question mark
64	0x40	100	@	At sign
65	0x41	101	A	Uppercase A
66	0x42	102	B	Uppercase B
67	0x43	103	C	Uppercase C
68	0x44	104	D	Uppercase D
69	0x45	105	E	Uppercase E
70	0x46	106	F	Uppercase F
71	0x47	107	G	Uppercase G
72	0x48	110	H	Uppercase H
73	0x49	111	I	Uppercase I
74	0x4A	112	J	Uppercase J
75	0x4B	113	K	Uppercase K
76	0x4C	114	L	Uppercase L
77	0x4D	115	M	Uppercase M
78	0x4E	116	N	Uppercase N
79	0x4F	117	O	Uppercase O
80	0x50	120	P	Uppercase P
81	0x51	121	Q	Uppercase Q
82	0x52	122	R	Uppercase R
83	0x53	123	S	Uppercase S
84	0x54	124	T	Uppercase T
85	0x55	125	U	Uppercase U
86	0x56	126	V	Uppercase V
87	0x57	127	W	Uppercase W
88	0x58	130	X	Uppercase X
89	0x59	131	Y	Uppercase Y
90	0x5A	132	Z	Uppercase Z
91	0x5B	133	[	Left square bracket
92	0x5C	134	\	Backslash
93	0x5D	135	]	Right square bracket
94	0x5E	136	^	Caret / Circumflex
95	0x5F	137	_	Underscore
96	0x60	140	`	Grave accent / Backtick
97	0x61	141	a	Lowercase a
98	0x62	142	b	Lowercase b
99	0x63	143	c	Lowercase c
100	0x64	144	d	Lowercase d
101	0x65	145	e	Lowercase e
102	0x66	146	f	Lowercase f
103	0x67	147	g	Lowercase g
104	0x68	150	h	Lowercase h
105	0x69	151	i	Lowercase i
106	0x6A	152	j	Lowercase j
107	0x6B	153	k	Lowercase k
108	0x6C	154	l	Lowercase l
109	0x6D	155	m	Lowercase m
110	0x6E	156	n	Lowercase n
111	0x6F	157	o	Lowercase o
112	0x70	160	p	Lowercase p
113	0x71	161	q	Lowercase q
114	0x72	162	r	Lowercase r
115	0x73	163	s	Lowercase s
116	0x74	164	t	Lowercase t
117	0x75	165	u	Lowercase u
118	0x76	166	v	Lowercase v
119	0x77	167	w	Lowercase w
120	0x78	170	x	Lowercase x
121	0x79	171	y	Lowercase y
122	0x7A	172	z	Lowercase z
123	0x7B	173	{	Left curly brace
124	0x7C	174	\|	Vertical bar / Pipe
125	0x7D	175	}	Right curly brace
126	0x7E	176	~	Tilde
127	0x7F	177	DEL	Delete

What is ASCII?

ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numeric values to 128 characters, including English letters, digits, punctuation marks, and control characters. Developed in the 1960s, ASCII forms the foundation of modern character encoding systems like UTF-8. Each ASCII character is represented by a 7-bit binary number (0-127).

FAQ

Q: What is the difference between ASCII and Unicode?

A: ASCII defines 128 characters using 7 bits. Unicode is a much larger standard that encompasses over 149,000 characters from virtually all writing systems. The first 128 Unicode code points are identical to ASCII, making ASCII a subset of Unicode.

Q: What are ASCII control characters?

A: Control characters (0-31 and 127) are non-printable characters originally used to control hardware devices like printers and teleprinters. Examples include NUL (null), LF (line feed/newline), CR (carriage return), TAB (horizontal tab), and ESC (escape).

Q: Why does ASCII only go up to 127?

A: ASCII uses 7 bits of data, which allows for 2^7 = 128 possible values (0-127). The 8th bit was originally used for parity checking in data transmission. Extended ASCII variants use all 8 bits to represent 256 characters, but these are not part of the standard ASCII specification.

Q: What is the ASCII value of the space character?

A: The space character has the ASCII value 32 (decimal), 20 (hexadecimal), or 040 (octal). It is the first printable ASCII character and is used to separate words in text.

Q: How is ASCII used in programming?

A: Programmers use ASCII values for character comparison, sorting, encryption, data validation, and converting between characters and their numeric representations. Most programming languages provide built-in functions to get the ASCII value of a character (e.g., ord() in Python, charCodeAt() in JavaScript).

ASCII Table

What is ASCII?

FAQ

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