ASCII Table — All 128 Characters

ASCII (American Standard Code for Information Interchange) maps 128 characters to the numbers 0–127. The table below lists every code in decimal, hexadecimal, and octal, alongside its character or control-code name. Codes 0–31 and 127 are control characters (they trigger actions rather than print), and 32–126 are printable characters including the space, digits, letters, and punctuation.

Dec	Hex	Oct	Char	Description
0	00	000	NUL	Null character
1	01	001	SOH	Start of Heading
2	02	002	STX	Start of Text
3	03	003	ETX	End of Text
4	04	004	EOT	End of Transmission
5	05	005	ENQ	Enquiry
6	06	006	ACK	Acknowledge
7	07	007	BEL	Bell (alert)
8	08	010	BS	Backspace
9	09	011	HT	Horizontal Tab
10	0A	012	LF	Line Feed (newline)
11	0B	013	VT	Vertical Tab
12	0C	014	FF	Form Feed (new page)
13	0D	015	CR	Carriage Return
14	0E	016	SO	Shift Out
15	0F	017	SI	Shift In
16	10	020	DLE	Data Link Escape
17	11	021	DC1	Device Control 1 (XON)
18	12	022	DC2	Device Control 2
19	13	023	DC3	Device Control 3 (XOFF)
20	14	024	DC4	Device Control 4
21	15	025	NAK	Negative Acknowledge
22	16	026	SYN	Synchronous Idle
23	17	027	ETB	End of Transmission Block
24	18	030	CAN	Cancel
25	19	031	EM	End of Medium
26	1A	032	SUB	Substitute
27	1B	033	ESC	Escape
28	1C	034	FS	File Separator
29	1D	035	GS	Group Separator
30	1E	036	RS	Record Separator
31	1F	037	US	Unit Separator
32	20	040	(space)	Space
33	21	041	!	Exclamation mark
34	22	042	"	Double quote
35	23	043	#	Number sign (hash)
36	24	044	$	Dollar sign
37	25	045	%	Percent sign
38	26	046	&	Ampersand
39	27	047	'	Single quote (apostrophe)
40	28	050	(	Left parenthesis
41	29	051	)	Right parenthesis
42	2A	052	*	Asterisk
43	2B	053	+	Plus sign
44	2C	054	,	Comma
45	2D	055	-	Hyphen-minus
46	2E	056	.	Period (full stop)
47	2F	057	/	Slash (solidus)
48	30	060	0	Digit zero
49	31	061	1	Digit one
50	32	062	2	Digit two
51	33	063	3	Digit three
52	34	064	4	Digit four
53	35	065	5	Digit five
54	36	066	6	Digit six
55	37	067	7	Digit seven
56	38	070	8	Digit eight
57	39	071	9	Digit nine
58	3A	072	:	Colon
59	3B	073	;	Semicolon
60	3C	074	<	Less-than sign
61	3D	075	=	Equals sign
62	3E	076	>	Greater-than sign
63	3F	077	?	Question mark
64	40	100	@	At sign
65	41	101	A	Uppercase letter A
66	42	102	B	Uppercase letter B
67	43	103	C	Uppercase letter C
68	44	104	D	Uppercase letter D
69	45	105	E	Uppercase letter E
70	46	106	F	Uppercase letter F
71	47	107	G	Uppercase letter G
72	48	110	H	Uppercase letter H
73	49	111	I	Uppercase letter I
74	4A	112	J	Uppercase letter J
75	4B	113	K	Uppercase letter K
76	4C	114	L	Uppercase letter L
77	4D	115	M	Uppercase letter M
78	4E	116	N	Uppercase letter N
79	4F	117	O	Uppercase letter O
80	50	120	P	Uppercase letter P
81	51	121	Q	Uppercase letter Q
82	52	122	R	Uppercase letter R
83	53	123	S	Uppercase letter S
84	54	124	T	Uppercase letter T
85	55	125	U	Uppercase letter U
86	56	126	V	Uppercase letter V
87	57	127	W	Uppercase letter W
88	58	130	X	Uppercase letter X
89	59	131	Y	Uppercase letter Y
90	5A	132	Z	Uppercase letter Z
91	5B	133	[	Left square bracket
92	5C	134	\	Backslash
93	5D	135	]	Right square bracket
94	5E	136	^	Caret (circumflex)
95	5F	137	_	Underscore (low line)
96	60	140	`	Grave accent (backtick)
97	61	141	a	Lowercase letter a
98	62	142	b	Lowercase letter b
99	63	143	c	Lowercase letter c
100	64	144	d	Lowercase letter d
101	65	145	e	Lowercase letter e
102	66	146	f	Lowercase letter f
103	67	147	g	Lowercase letter g
104	68	150	h	Lowercase letter h
105	69	151	i	Lowercase letter i
106	6A	152	j	Lowercase letter j
107	6B	153	k	Lowercase letter k
108	6C	154	l	Lowercase letter l
109	6D	155	m	Lowercase letter m
110	6E	156	n	Lowercase letter n
111	6F	157	o	Lowercase letter o
112	70	160	p	Lowercase letter p
113	71	161	q	Lowercase letter q
114	72	162	r	Lowercase letter r
115	73	163	s	Lowercase letter s
116	74	164	t	Lowercase letter t
117	75	165	u	Lowercase letter u
118	76	166	v	Lowercase letter v
119	77	167	w	Lowercase letter w
120	78	170	x	Lowercase letter x
121	79	171	y	Lowercase letter y
122	7A	172	z	Lowercase letter z
123	7B	173	{	Left curly brace
124	7C	174	\|	Vertical bar (pipe)
125	7D	175	}	Right curly brace
126	7E	176	~	Tilde
127	7F	177	DEL	Delete

What is an ASCII table?

An ASCII table is the lookup chart that pairs each ASCII number with the character it represents. Computers store text as numbers, and ASCII was the standard agreement — dating to 1963 — for which number means which character. The letter A is 65, a is 97, the digit 0 is 48, and a space is 32.

Because ASCII uses only 7 bits, it has exactly 2^7 = 128 slots. That is why the table runs from 0 to 127 and no further. Anything beyond 127 belongs to an extended set or to Unicode, not to ASCII proper.

How to read the table

Each row shows one character four ways. Dec is the decimal (base-10) code you will see most often in programming. Hex is the base-16 code, common in memory dumps and escapes like \x41 for A. Oct is the base-8 code, used in older systems and in escapes like \101.

The character column shows the printable glyph, or for control codes the standard abbreviation (NUL, CR, LF, ESC, DEL) and a short description. A useful pattern: uppercase and lowercase letters differ by exactly 32 (A=65, a=97), which is a single bit, so flipping case is a fast bit operation.

Extended ASCII and Unicode

You will often hear about "extended ASCII" — sets that use an eighth bit to add codes 128–255 for accented letters, box-drawing characters, and symbols. These are not part of standard ASCII; they are separate code pages (like Latin-1 or code page 437) that disagree with each other above 127.

Modern software has largely moved to Unicode and UTF-8, which cover every writing system. The good news is that UTF-8 was designed so the first 128 code points are byte-for-byte identical to ASCII. Every ASCII file is already a valid UTF-8 file.

FAQ

How many characters are in the ASCII table?

Exactly 128, numbered 0 to 127. This is because ASCII is a 7-bit code, and 7 bits can represent 2^7 = 128 distinct values.

What is the ASCII code for A and a?

Uppercase A is 65 (hex 41) and lowercase a is 97 (hex 61). They differ by 32, which is true for every letter — a handy shortcut for changing case.

What are the control characters in ASCII?

Codes 0–31 plus 127 are control characters. They do not print; they signal actions such as line feed (10), carriage return (13), tab (9), escape (27), and delete (127).

What is the difference between ASCII and extended ASCII?

Standard ASCII covers codes 0–127. Extended ASCII adds codes 128–255 using an eighth bit, but there is no single standard for those — different code pages assign them differently, which is one reason Unicode replaced them.

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