ASCII table

The denary, hexadecimal and binary code for every ASCII character.

Binary:

0–31 Control codes

You don’t need to learn these. They aren’t letters, numbers or symbols: they are instructions. Most were made for teleprinters and early computer links, so only a few are still used today.

Denary	Hex	Binary	Character
0	00	0000 0000	Null – nothing; used to mark the end of some textStill used
1	01	0000 0001	Start of heading – marked the start of a message’s headingRarely used today
2	02	0000 0010	Start of text – marked where a message’s text beganRarely used today
3	03	0000 0011	End of text – marked where a message’s text endedRarely used today
4	04	0000 0100	End of transmission – meant “message finished”Rarely used today
5	05	0000 0101	Enquiry – asked another machine “are you there?”Rarely used today
6	06	0000 0110	Acknowledge – replied “yes, received OK”Rarely used today
7	07	0000 0111	Bell – made the computer beep (old teleprinters rang a real bell)Still used
8	08	0000 1000	Backspace – the Backspace key: moves back one characterStill used
9	09	0000 1001	Horizontal tab – the Tab keyStill used
10	0A	0000 1010	Line feed – moves down to a new lineStill used
11	0B	0000 1011	Vertical tab – moves down several linesRarely used today
12	0C	0000 1100	Form feed – told a printer to start a new pageRarely used today
13	0D	0000 1101	Carriage return – moves back to the start of the line (the Enter key)Still used
14	0E	0000 1110	Shift out – switched to a different set of charactersRarely used today
15	0F	0000 1111	Shift in – switched back to the normal charactersRarely used today
16	10	0001 0000	Data link escape – controlled a data connection between machinesRarely used today
17	11	0001 0001	Device control 1 – told a device to carry on sendingRarely used today
18	12	0001 0010	Device control 2 – controlled a device such as a printerRarely used today
19	13	0001 0011	Device control 3 – told a device to pause sendingRarely used today
20	14	0001 0100	Device control 4 – controlled a device such as a printerRarely used today
21	15	0001 0101	Negative acknowledge – replied “error, please send again”Rarely used today
22	16	0001 0110	Synchronous idle – kept a connection in step while no data was sentRarely used today
23	17	0001 0111	End of transmission block – marked the end of a block of dataRarely used today
24	18	0001 1000	Cancel – meant “ignore the data just sent”Rarely used today
25	19	0001 1001	End of medium – reached the end of a tape or diskRarely used today
26	1A	0001 1010	Substitute – replaced a character that arrived damagedRarely used today
27	1B	0001 1011	Escape – the Esc keyStill used
28	1C	0001 1100	File separator – split data into sections (largest)Rarely used today
29	1D	0001 1101	Group separator – split data into sectionsRarely used today
30	1E	0001 1110	Record separator – split data into sectionsRarely used today
31	1F	0001 1111	Unit separator – split data into sections (smallest)Rarely used today

32–63 Space, symbols and digits

The digits 0–9 are codes 48–57

Denary	Hex	Binary	Character
32	20	0010 0000	Space (the spacebar)
33	21	0010 0001	!
34	22	0010 0010	"
35	23	0010 0011	#
36	24	0010 0100	$
37	25	0010 0101	%
38	26	0010 0110	&
39	27	0010 0111	'
40	28	0010 1000	(
41	29	0010 1001	)
42	2A	0010 1010	*
43	2B	0010 1011	+
44	2C	0010 1100	,
45	2D	0010 1101	-
46	2E	0010 1110	.
47	2F	0010 1111	/
48	30	0011 0000	0
49	31	0011 0001	1
50	32	0011 0010	2
51	33	0011 0011	3
52	34	0011 0100	4
53	35	0011 0101	5
54	36	0011 0110	6
55	37	0011 0111	7
56	38	0011 1000	8
57	39	0011 1001	9
58	3A	0011 1010	:
59	3B	0011 1011	;
60	3C	0011 1100	<
61	3D	0011 1101	=
62	3E	0011 1110	>
63	3F	0011 1111	?

64–95 Upper-case letters

A is 65; each letter is one more than the last

Denary	Hex	Binary	Character
64	40	0100 0000	@
65	41	0100 0001	A
66	42	0100 0010	B
67	43	0100 0011	C
68	44	0100 0100	D
69	45	0100 0101	E
70	46	0100 0110	F
71	47	0100 0111	G
72	48	0100 1000	H
73	49	0100 1001	I
74	4A	0100 1010	J
75	4B	0100 1011	K
76	4C	0100 1100	L
77	4D	0100 1101	M
78	4E	0100 1110	N
79	4F	0100 1111	O
80	50	0101 0000	P
81	51	0101 0001	Q
82	52	0101 0010	R
83	53	0101 0011	S
84	54	0101 0100	T
85	55	0101 0101	U
86	56	0101 0110	V
87	57	0101 0111	W
88	58	0101 1000	X
89	59	0101 1001	Y
90	5A	0101 1010	Z
91	5B	0101 1011	[
92	5C	0101 1100	\
93	5D	0101 1101	]
94	5E	0101 1110	^
95	5F	0101 1111	_

96–127 Lower-case letters

a is 97: always 32 more than its capital

Denary	Hex	Binary	Character
96	60	0110 0000	`
97	61	0110 0001	a
98	62	0110 0010	b
99	63	0110 0011	c
100	64	0110 0100	d
101	65	0110 0101	e
102	66	0110 0110	f
103	67	0110 0111	g
104	68	0110 1000	h
105	69	0110 1001	i
106	6A	0110 1010	j
107	6B	0110 1011	k
108	6C	0110 1100	l
109	6D	0110 1101	m
110	6E	0110 1110	n
111	6F	0110 1111	o
112	70	0111 0000	p
113	71	0111 0001	q
114	72	0111 0010	r
115	73	0111 0011	s
116	74	0111 0100	t
117	75	0111 0101	u
118	76	0111 0110	v
119	77	0111 0111	w
120	78	0111 1000	x
121	79	0111 1001	y
122	7A	0111 1010	z
123	7B	0111 1011	{
124	7C	0111 1100	\|
125	7D	0111 1101	}
126	7E	0111 1110	~
127	7F	0111 1111	Delete (the Delete key)