ASCII Code Table

ASCII (American Standard Code for Information Interchange) includes 128 characters (0-127). Codes 0-31 and 127 are control characters; 32-126 are printable characters.

How It Works

ASCII (American Standard Code for Information Interchange) encodes characters in 7 bits, giving code points 0–127, and became the de-facto standard for early computers. Code points 0–31 and 127 are control characters (e.g. LF, TAB, CR); 32–126 are printable (letters, digits, punctuation).

Because 7 bits only covers English, "extended ASCII" uses the 8th bit for 128–255, but that range has no single standard — Windows-1252, ISO-8859-1 and others disagree, which is why raw binary text often shows mojibake across systems.

DEC	HEX	Char	Name	Chinese Name
0	0x00	NUL	Null	空字符
1	0x01	SOH	Start of Heading	标题开始
2	0x02	STX	Start of Text	正文开始
3	0x03	ETX	End of Text	正文结束
4	0x04	EOT	End of Transmission	传输结束
5	0x05	ENQ	Enquiry	询问
6	0x06	ACK	Acknowledge	确认
7	0x07	BEL	Bell	响铃
8	0x08	BS	Backspace	退格
9	0x09	HT	Horizontal Tab	水平制表
10	0x0A	LF	Line Feed	换行
11	0x0B	VT	Vertical Tab	垂直制表
12	0x0C	FF	Form Feed	换页
13	0x0D	CR	Carriage Return	回车
14	0x0E	SO	Shift Out	移出
15	0x0F	SI	Shift In	移入
16	0x10	DLE	Data Link Escape	数据链路转义
17	0x11	DC1	Device Control 1	设备控制1
18	0x12	DC2	Device Control 2	设备控制2
19	0x13	DC3	Device Control 3	设备控制3
20	0x14	DC4	Device Control 4	设备控制4
21	0x15	NAK	Negative Acknowledge	否定确认
22	0x16	SYN	Synchronous Idle	同步空闲
23	0x17	ETB	End of Trans. Block	传输块结束
24	0x18	CAN	Cancel	取消
25	0x19	EM	End of Medium	介质结束
26	0x1A	SUB	Substitute	替换
27	0x1B	ESC	Escape	转义
28	0x1C	FS	File Separator	文件分隔符
29	0x1D	GS	Group Separator	组分隔符
30	0x1E	RS	Record Separator	记录分隔符
31	0x1F	US	Unit Separator	单元分隔符
32	0x20	SP	Space	空格
33	0x21	!	Exclamation Mark	感叹号
34	0x22	"	Quotation Mark	双引号
35	0x23	#	Number Sign	井号
36	0x24	$	Dollar Sign	美元符号
37	0x25	%	Percent Sign	百分号
38	0x26	&	Ampersand	与号
39	0x27	'	Apostrophe	单引号
40	0x28	(	Left Parenthesis	左括号
41	0x29	)	Right Parenthesis	右括号
42	0x2A	*	Asterisk	星号
43	0x2B	+	Plus Sign	加号
44	0x2C	,	Comma	逗号
45	0x2D	-	Hyphen	连字符
46	0x2E	.	Period	句点
47	0x2F	/	Slash	斜杠
48	0x30	0	Digit Zero	数字 0
49	0x31	1	1	1
50	0x32	2	2	2
51	0x33	3	3	3
52	0x34	4	4	4
53	0x35	5	5	5
54	0x36	6	6	6
55	0x37	7	7	7
56	0x38	8	8	8
57	0x39	9	Digit Nine	数字 9
58	0x3A	:	:	:
59	0x3B	;	;	;
60	0x3C	<	<	<
61	0x3D	=	=	=
62	0x3E	>	>	>
63	0x3F	?	?	?
64	0x40	@	@	@
65	0x41	A	Uppercase A	大写 A
66	0x42	B	B	B
67	0x43	C	C	C
68	0x44	D	D	D
69	0x45	E	E	E
70	0x46	F	F	F
71	0x47	G	G	G
72	0x48	H	H	H
73	0x49	I	I	I
74	0x4A	J	J	J
75	0x4B	K	K	K
76	0x4C	L	L	L
77	0x4D	M	M	M
78	0x4E	N	N	N
79	0x4F	O	O	O
80	0x50	P	P	P
81	0x51	Q	Q	Q
82	0x52	R	R	R
83	0x53	S	S	S
84	0x54	T	T	T
85	0x55	U	U	U
86	0x56	V	V	V
87	0x57	W	W	W
88	0x58	X	X	X
89	0x59	Y	Y	Y
90	0x5A	Z	Uppercase Z	大写 Z
91	0x5B	[	[	[
92	0x5C	\	\	\
93	0x5D	]	]	]
94	0x5E	^	^	^
95	0x5F	_	_	_
96	0x60	`	`	`
97	0x61	a	Lowercase a	小写 a
98	0x62	b	b	b
99	0x63	c	c	c
100	0x64	d	d	d
101	0x65	e	e	e
102	0x66	f	f	f
103	0x67	g	g	g
104	0x68	h	h	h
105	0x69	i	i	i
106	0x6A	j	j	j
107	0x6B	k	k	k
108	0x6C	l	l	l
109	0x6D	m	m	m
110	0x6E	n	n	n
111	0x6F	o	o	o
112	0x70	p	p	p
113	0x71	q	q	q
114	0x72	r	r	r
115	0x73	s	s	s
116	0x74	t	t	t
117	0x75	u	u	u
118	0x76	v	v	v
119	0x77	w	w	w
120	0x78	x	x	x
121	0x79	y	y	y
122	0x7A	z	Lowercase z	小写 z
123	0x7B	{	{	{
124	0x7C	\|	\|	\|
125	0x7D	}	}	}
126	0x7E	~	~	~
127	0x7F	DEL	Delete	删除

Frequently Asked Questions

What is ASCII?

ASCII (American Standard Code for Information Interchange) uses 7 bits to represent 128 characters including letters, digits, punctuation and control characters — the most basic character encoding.

How is ASCII related to Unicode?

ASCII covers only 128 characters; Unicode is a superset that is compatible with the first 128 ASCII code points and extends to every writing system. UTF-8 is an ASCII-compatible Unicode encoding.

What are control characters?

Code points 0-31 and 127 are control characters (e.g. LF, CR, Tab) that are not printable; they are used for device control and text formatting.

Why represent ASCII in hex?

Hexadecimal is more compact and readable than binary or decimal (0x41 = "A"), and is most common when debugging protocols and parsing messages.

How do I look up the ASCII code of a character?

Find the character in the Char column of the table above; the DEC value on its left is the ASCII code and HEX is the hexadecimal form. For example "A" is 65 (0x41), the space (SP) is 32 (0x20), and line feed (LF) is 10 (0x0A).