The ASCII text encoding is an alphabet. It contains 128 characters.

34 characters are non-printing control characters. 94 characters are printable (they have individual visible glyphs).

The first 33 characters (characters 0-32) and the last character (character 127) are the non-printing control characters. Characters 33-126 are the printable ASCII characters.

The horizontal tab (HT), the line feed (LF), and the space (SPA) characters are whitespace characters. They are non-printing control characters but they are used to affect the visible layout of the printable text.

Notes:
- The line feed character is often known as the "newline" character.
- The horizontal tab character is often referred to simply as the "tab" character.
- More whitespace characters exist but are rarely used.

The table below contains the 94 printable characters and the 3 important whitespace characters.

More information concerning ASCII, including the remaining non-printing control characters, can be found in the following article:
The ASCII text encoding

Table 1: The printable ASCII characters and the important whitespace characters
0
Note: The binary and hex values are 8-bit.
0
Decimal	Character	Binary	Hex
0
9	HT	0000 1001	09
10	LF	0000 1010	0a
32	SPA	0010 0000	20
33	!	0010 0001	21
34	"	0010 0010	22
35	#	0010 0011	23
36	$	0010 0100	24
37	%	0010 0101	25
38	&	0010 0110	26
39	'	0010 0111	27
40	(	0010 1000	28
41	)	0010 1001	29
42	*	0010 1010	2a
43	+	0010 1011	2b
44	,	0010 1100	2c
45	-	0010 1101	2d
46	.	0010 1110	2e
47	/	0010 1111	2f
48	0	0011 0000	30
49	1	0011 0001	31
50	2	0011 0010	32
51	3	0011 0011	33
52	4	0011 0100	34
53	5	0011 0101	35
54	6	0011 0110	36
55	7	0011 0111	37
56	8	0011 1000	38
57	9	0011 1001	39
58	:	0011 1010	3a
59	;	0011 1011	3b
60	<	0011 1100	3c
61	=	0011 1101	3d
62	>	0011 1110	3e
63	?	0011 1111	3f
64	@	0100 0000	40
65	A	0100 0001	41
66	B	0100 0010	42
67	C	0100 0011	43
68	D	0100 0100	44
69	E	0100 0101	45
70	F	0100 0110	46
71	G	0100 0111	47
72	H	0100 1000	48
73	I	0100 1001	49
74	J	0100 1010	4a
75	K	0100 1011	4b
76	L	0100 1100	4c
77	M	0100 1101	4d
78	N	0100 1110	4e
79	O	0100 1111	4f
80	P	0101 0000	50
81	Q	0101 0001	51
82	R	0101 0010	52
83	S	0101 0011	53
84	T	0101 0100	54
85	U	0101 0101	55
86	V	0101 0110	56
87	W	0101 0111	57
88	X	0101 1000	58
89	Y	0101 1001	59
90	Z	0101 1010	5a
91	[	0101 1011	5b
92	\	0101 1100	5c
93	]	0101 1101	5d
94	^	0101 1110	5e
95	_	0101 1111	5f
96	`	0110 0000	60
97	a	0110 0001	61
98	b	0110 0010	62
99	c	0110 0011	63
100	d	0110 0100	64
101	e	0110 0101	65
102	f	0110 0110	66
103	g	0110 0111	67
104	h	0110 1000	68
105	i	0110 1001	69
106	j	0110 1010	6a
107	k	0110 1011	6b
108	l	0110 1100	6c
109	m	0110 1101	6d
110	n	0110 1110	6e
111	o	0110 1111	6f
112	p	0111 0000	70
113	q	0111 0001	71
114	r	0111 0010	72
115	s	0111 0011	73
116	t	0111 0100	74
117	u	0111 0101	75
118	v	0111 0110	76
119	w	0111 0111	77
120	x	0111 1000	78
121	y	0111 1001	79
122	z	0111 1010	7a
123	{	0111 1011	7b
124	|	0111 1100	7c
125	}	0111 1101	7d
126	~	0111 1110	7e

This information was originally published in the article The ASCII text encoding. It has been edited for republication.