ASCII Table & Control Characters

ASCII 0–127 in decimal, hex, binary and text, with names, caret and escape notation for control characters like STX, ETX, ACK, NAK, CR, LF, XON and XOFF.

Find (character, decimal, hex, abbreviation or name — e.g. A, 13, 0x0D, STX, line feed)

Dec	Hex	Binary	Char / abbr.	Name	Notation
0	00	0000000	NUL	Null	^@ \0
1	01	0000001	SOH	Start of Heading	^A
2	02	0000010	STX	Start of Text	^B
3	03	0000011	ETX	End of Text	^C
4	04	0000100	EOT	End of Transmission	^D
5	05	0000101	ENQ	Enquiry	^E
6	06	0000110	ACK	Acknowledge	^F
7	07	0000111	BEL	Bell	^G \a
8	08	0001000	BS	Backspace	^H \b
9	09	0001001	HT	Horizontal Tabulation	^I \t
10	0A	0001010	LF	Line Feed	^J \n
11	0B	0001011	VT	Vertical Tabulation	^K \v
12	0C	0001100	FF	Form Feed	^L \f
13	0D	0001101	CR	Carriage Return	^M \r
14	0E	0001110	SO	Shift Out	^N
15	0F	0001111	SI	Shift In	^O
16	10	0010000	DLE	Data Link Escape	^P
17	11	0010001	DC1	Device Control 1	^Q
18	12	0010010	DC2	Device Control 2	^R
19	13	0010011	DC3	Device Control 3	^S
20	14	0010100	DC4	Device Control 4 (Stop)	^T
21	15	0010101	NAK	Negative Acknowledge	^U
22	16	0010110	SYN	Synchronous Idle	^V
23	17	0010111	ETB	End of Transmission Block	^W
24	18	0011000	CAN	Cancel	^X
25	19	0011001	EM	End of Medium	^Y
26	1A	0011010	SUB	Substitute	^Z
27	1B	0011011	ESC	Escape	^[ \x1B
28	1C	0011100	FS	File Separator	^\
29	1D	0011101	GS	Group Separator	^]
30	1E	0011110	RS	Record Separator	^^
31	1F	0011111	US	Unit Separator	^_
32	20	0100000	SP	Space
33	21	0100001	!
34	22	0100010	"
35	23	0100011	#
36	24	0100100	$
37	25	0100101	%
38	26	0100110	&
39	27	0100111	'
40	28	0101000	(
41	29	0101001	)
42	2A	0101010	*
43	2B	0101011	+
44	2C	0101100	,
45	2D	0101101	-
46	2E	0101110	.
47	2F	0101111	/
48	30	0110000	0
49	31	0110001	1
50	32	0110010	2
51	33	0110011	3
52	34	0110100	4
53	35	0110101	5
54	36	0110110	6
55	37	0110111	7
56	38	0111000	8
57	39	0111001	9
58	3A	0111010	:
59	3B	0111011	;
60	3C	0111100	<
61	3D	0111101	=
62	3E	0111110	>
63	3F	0111111	?
64	40	1000000	@
65	41	1000001	A
66	42	1000010	B
67	43	1000011	C
68	44	1000100	D
69	45	1000101	E
70	46	1000110	F
71	47	1000111	G
72	48	1001000	H
73	49	1001001	I
74	4A	1001010	J
75	4B	1001011	K
76	4C	1001100	L
77	4D	1001101	M
78	4E	1001110	N
79	4F	1001111	O
80	50	1010000	P
81	51	1010001	Q
82	52	1010010	R
83	53	1010011	S
84	54	1010100	T
85	55	1010101	U
86	56	1010110	V
87	57	1010111	W
88	58	1011000	X
89	59	1011001	Y
90	5A	1011010	Z
91	5B	1011011	[
92	5C	1011100	\
93	5D	1011101	]
94	5E	1011110	^
95	5F	1011111	_
96	60	1100000	`
97	61	1100001	a
98	62	1100010	b
99	63	1100011	c
100	64	1100100	d
101	65	1100101	e
102	66	1100110	f
103	67	1100111	g
104	68	1101000	h
105	69	1101001	i
106	6A	1101010	j
107	6B	1101011	k
108	6C	1101100	l
109	6D	1101101	m
110	6E	1101110	n
111	6F	1101111	o
112	70	1110000	p
113	71	1110001	q
114	72	1110010	r
115	73	1110011	s
116	74	1110100	t
117	75	1110101	u
118	76	1110110	v
119	77	1110111	w
120	78	1111000	x
121	79	1111001	y
122	7A	1111010	z
123	7B	1111011	{
124	7C	1111100	\|
125	7D	1111101	}
126	7E	1111110	~
127	7F	1111111	DEL	Delete	^?

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Control characters you meet on serial links

Hex	Abbr.	Common use
02 · 03	STX · ETX	Mark the start and end of a frame. Many vendor protocols use «STX text ETX checksum» (whether the checksum covers STX varies by manual).
05	ENQ	Some protocols send it as a «please reply» request.
06 · 15	ACK · NAK	Received / not received (send again).
0D · 0A	CR · LF	Line endings. Devices expect CR, LF or CR LF — if commands are ignored, match the line ending first.
11 · 13	DC1 · DC3	Software flow control XON (resume) and XOFF (stop). With it enabled, raw 11 and 13 bytes must not appear in the data.
1B	ESC	Starts terminal control sequences (ESC [ …).
00	NUL	Empty byte; some devices use it to end a string.

128–255 and non-Latin text

ASCII stops at 7 bits (0–127). Bytes 128–255 depend on the code page (ISO 8859-1, CP949 and others), so they are not in this table.
Korean, Chinese and Japanese characters take several bytes — 3 in UTF-8, 2 in CP949 for Korean. Garbled text between a device and a PC usually means different encodings.
Caret notation ^M is the code Ctrl+M produces (0x0D); the escape \r is how C-like languages write it in strings.

FAQ

What are CR and LF?

CR (carriage return) is 13 (0x0D) and LF (line feed) is 10 (0x0A). Windows text files end lines with CR LF (0D 0A).

Is the character '0' the same as the value 0?

No. The character '0' is 48 (0x30); the value 0 is NUL (0x00). A device sending numbers as ASCII sends '1' '2' '3' as 31 32 33.

How far apart are upper and lower case?

32 (0x20). 'A' is 65 (0x41) and 'a' is 97 (0x61) — they differ in one bit.

Is DEL (0x7F) a control character?

RFC 20 lists DEL with the control characters but notes that «in the strict sense, DEL is not a control character». This table marks it with the controls.

To turn bytes into text or text into bytes, use the HEX ↔ ASCII Converter.