ASCII Table

All 128 ASCII characters in decimal, hexadecimal, binary and octal.

ASCII (the American Standard Code for Information Interchange) gives each of 128 characters a number from 0 to 127: 33 control codes such as line feed and escape, and 95 printable characters. It is the foundation of text on computers: the first 128 code points of Unicode and UTF-8 are the same.

The table

128 rows

Decimal	Hex	Binary	Octal	Character
0	00	00000000	000	NUL (control)
1	01	00000001	001	SOH (control)
2	02	00000010	002	STX (control)
3	03	00000011	003	ETX (control)
4	04	00000100	004	EOT (control)
5	05	00000101	005	ENQ (control)
6	06	00000110	006	ACK (control)
7	07	00000111	007	BEL (control)
8	08	00001000	010	BS (control)
9	09	00001001	011	HT (control)
10	0A	00001010	012	LF (control)
11	0B	00001011	013	VT (control)
12	0C	00001100	014	FF (control)
13	0D	00001101	015	CR (control)
14	0E	00001110	016	SO (control)
15	0F	00001111	017	SI (control)
16	10	00010000	020	DLE (control)
17	11	00010001	021	DC1 (control)
18	12	00010010	022	DC2 (control)
19	13	00010011	023	DC3 (control)
20	14	00010100	024	DC4 (control)
21	15	00010101	025	NAK (control)
22	16	00010110	026	SYN (control)
23	17	00010111	027	ETB (control)
24	18	00011000	030	CAN (control)
25	19	00011001	031	EM (control)
26	1A	00011010	032	SUB (control)
27	1B	00011011	033	ESC (control)
28	1C	00011100	034	FS (control)
29	1D	00011101	035	GS (control)
30	1E	00011110	036	RS (control)
31	1F	00011111	037	US (control)
32	20	00100000	040	space
33	21	00100001	041	!
34	22	00100010	042	"
35	23	00100011	043	#
36	24	00100100	044	$
37	25	00100101	045	%
38	26	00100110	046	&
39	27	00100111	047	'
40	28	00101000	050	(
41	29	00101001	051	)
42	2A	00101010	052	*
43	2B	00101011	053	+
44	2C	00101100	054	,
45	2D	00101101	055	-
46	2E	00101110	056	.
47	2F	00101111	057	/
48	30	00110000	060	0
49	31	00110001	061	1
50	32	00110010	062	2
51	33	00110011	063	3
52	34	00110100	064	4
53	35	00110101	065	5
54	36	00110110	066	6
55	37	00110111	067	7
56	38	00111000	070	8
57	39	00111001	071	9
58	3A	00111010	072	:
59	3B	00111011	073	;
60	3C	00111100	074	<
61	3D	00111101	075	=
62	3E	00111110	076	>
63	3F	00111111	077	?
64	40	01000000	100	@
65	41	01000001	101	A
66	42	01000010	102	B
67	43	01000011	103	C
68	44	01000100	104	D
69	45	01000101	105	E
70	46	01000110	106	F
71	47	01000111	107	G
72	48	01001000	110	H
73	49	01001001	111	I
74	4A	01001010	112	J
75	4B	01001011	113	K
76	4C	01001100	114	L
77	4D	01001101	115	M
78	4E	01001110	116	N
79	4F	01001111	117	O
80	50	01010000	120	P
81	51	01010001	121	Q
82	52	01010010	122	R
83	53	01010011	123	S
84	54	01010100	124	T
85	55	01010101	125	U
86	56	01010110	126	V
87	57	01010111	127	W
88	58	01011000	130	X
89	59	01011001	131	Y
90	5A	01011010	132	Z
91	5B	01011011	133	[
92	5C	01011100	134	\
93	5D	01011101	135	]
94	5E	01011110	136	^
95	5F	01011111	137	_
96	60	01100000	140	`
97	61	01100001	141	a
98	62	01100010	142	b
99	63	01100011	143	c
100	64	01100100	144	d
101	65	01100101	145	e
102	66	01100110	146	f
103	67	01100111	147	g
104	68	01101000	150	h
105	69	01101001	151	i
106	6A	01101010	152	j
107	6B	01101011	153	k
108	6C	01101100	154	l
109	6D	01101101	155	m
110	6E	01101110	156	n
111	6F	01101111	157	o
112	70	01110000	160	p
113	71	01110001	161	q
114	72	01110010	162	r
115	73	01110011	163	s
116	74	01110100	164	t
117	75	01110101	165	u
118	76	01110110	166	v
119	77	01110111	167	w
120	78	01111000	170	x
121	79	01111001	171	y
122	7A	01111010	172	z
123	7B	01111011	173	{
124	7C	01111100	174	\|
125	7D	01111101	175	}
126	7E	01111110	176	~
127	7F	01111111	177	DEL (control)

Source and notes: ANSI X3.4 / ISO 646 (ASCII); the first 128 code points of Unicode and UTF-8.

How to use this table

Filter on a character, a number or a hex code to find a row.
Use the hex column when reading memory, serial data or a protocol trace.
Use the binary column when checking individual bits.

Worked example

The text “Hi” is the two bytes 72 and 105 in decimal, which are 48 69 in hex.
Capital “A” is 65 (0x41) and lowercase “a” is 97 (0x61): they differ only in bit 5 (value 32), so setting or clearing that one bit changes the case of a letter.
The digit characters “0” to “9” are 48 to 57 (0x30 to 0x39): subtract 48 to turn a digit character into its value.

Notes and cautions

Codes above 127 are not ASCII. They belong to extended sets (Latin-1, Windows-1252) or to UTF-8 multi-byte sequences.
Line endings differ: Unix uses LF (10), Windows uses CR LF (13 then 10).

FAQ

What is the ASCII code for a space?

32, which is 0x20.

How many characters does ASCII have?

128, numbered 0 to 127, using 7 bits. A byte has 8 bits, so the top bit is unused in pure ASCII.

Sources

ANSI X3.4-1986 (ASCII); ISO/IEC 646; The Unicode Standard, Basic Latin block.
ANSI X3.4 / ISO 646 (ASCII); the first 128 code points of Unicode and UTF-8.