ASCII table

ASCII is a standard for character encoding used by computers and communications equipment to represent text. ASCII is short for American Standard Code for Information Interchange. You can find the ASCII table below.

Computers can only understand numbers, so a code ASCII is the numerical representation of a character such as M or 8 or $ or an action of some sort. ASCII uses a single byte to represent each character. A byte is generally the smallest addressable unit of data on a computer. It is a continuous sequence of eight bits, that is zeros or ones.

This means that one byte could represent any of 256 characters ranging in binary notation from 00000000 to 11111111. Eight bits allows 256 combinations of zeros and ones.

ASCII table

This following ASCII table lists the ASCII characters and their decimal, octal and hexadecimal numbers.

Below you can find the 128 standard character encodings in US-ASCII, which is the original and most basic version of ASCII. Each of these numbers in the ASCII table is a seven digit binary number between 00000000 and 01111111. The eighth bit (the left-most bit) was originally reserved for use as a parity bit.

The first 32 ASCII codes in the ASCII table below (zero through 31 in decimal notation, or 00000000 through 00011111 in binary) are reserved and are called control characters. These are non-printing ASCII characters. They were originally intended to control devices, most importantly printers. These characters appear in the most left column. The ASCII non-printing characters are rarely used for their original purpose these days.

Char	Dec	Oct	Hex	/	Char	Dec	Oct	Hex	/	Char	Dec	Oct	Hex	/	Char	Dec	Oct	Hex
null byte	0	0000	0x00	|	space	32	0040	0x20	|	@	64	0100	0x40	|	`	96	0140	0x60
start of heading	1	0001	0x01	|	!	33	0041	0x21	|	A	65	0101	0x41	|	a	97	0141	0x61
start of text	2	0002	0x02	|	“	34	0042	0x22	|	B	66	0102	0x42	|	b	98	0142	0x62
end of text	3	0003	0x03	|	#	35	0043	0x23	|	C	67	0103	0x43	|	c	99	0143	0x63
end of transmission	4	0004	0x04	|	$	36	0044	0x24	|	D	68	0104	0x44	|	d	100	0144	0x64
enquiry	5	0005	0x05	|	%	37	0045	0x25	|	E	69	0105	0x45	|	e	101	0145	0x65
acknowledge	6	0006	0x06	|	&	38	0046	0x26	|	F	70	0106	0x46	|	f	102	0146	0x66
bell character	7	0007	0x07	|	‘	39	0047	0x27	|	G	71	0107	0x47	|	g	103	0147	0x67
backspace	8	0010	0x08	|	(	40	0050	0x28	|	H	72	0110	0x48	|	h	104	0150	0x68
horizontal tab	9	0011	0x09	|	)	41	0051	0x29	|	I	73	0111	0x49	|	i	105	0151	0x69
newline	10	0012	0x0a	|	*	42	0052	0x2a	|	J	74	0112	0x4a	|	j	106	0152	0x6a
vertical tab	11	0013	0x0b	|	+	43	0053	0x2b	|	K	75	0113	0x4b	|	k	107	0153	0x6b
formfeed	12	0014	0x0c	|	,	44	0054	0x2c	|	L	76	0114	0x4c	|	l	108	0154	0x6c
carriage return	13	0015	0x0d	|	–	45	0055	0x2d	|	M	77	0115	0x4d	|	m	109	0155	0x6d
shift out	14	0016	0x0e	|	.	46	0056	0x2e	|	N	78	0116	0x4e	|	n	110	0156	0x6e
shift in	15	0017	0x0f	|	/	47	0057	0x2f	|	O	79	0117	0x4f	|	o	111	0157	0x6f
data link escape	16	0020	0x10	|	0	48	0060	0x30	|	P	80	0120	0x50	|	p	112	0160	0x70
device control 1	17	0021	0x11	|	1	49	0061	0x31	|	Q	81	0121	0x51	|	q	113	0161	0x71
device control 2	18	0022	0x12	|	2	50	0062	0x32	|	R	82	0122	0x52	|	r	114	0162	0x72
device control 3	19	0023	0x13	|	3	51	0063	0x33	|	S	83	0123	0x53	|	s	115	0163	0x73
device control 4	20	0024	0x14	|	4	52	0064	0x34	|	T	84	0124	0x54	|	t	116	0164	0x74
negative acknowledge	21	0025	0x15	|	5	53	0065	0x35	|	U	85	0125	0x55	|	u	117	0165	0x75
synchronous idle	22	0026	0x16	|	6	54	0066	0x36	|	V	86	0126	0x56	|	v	118	0166	0x76
end of trans block	23	0027	0x17	|	7	55	0067	0x37	|	W	87	0127	0x57	|	w	119	0167	0x77
cancel	24	0030	0x18	|	8	56	0070	0x38	|	X	88	0130	0x58	|	x	120	0170	0x78
end of medium	25	0031	0x19	|	9	57	0071	0x39	|	Y	89	0131	0x59	|	y	121	0171	0x79
substitute	26	0032	0x1a	|	:	58	0072	0x3a	|	Z	90	0132	0x5a	|	z	122	0172	0x7a
escape	27	0033	0x1b	|	;	59	0073	0x3b	|	[	91	0133	0x5b	|	{	123	0173	0x7b
file separator	28	0034	0x1c	|	<	60	0074	0x3c	|	\	92	0134	0x5c	|	|	124	0174	0x7c
group separator	29	0035	0x1d	|	=	61	0075	0x3d	|	]	93	0135	0x5d	|	}	125	0175	0x7d
record separator	30	0036	0x1e	|	>	62	0076	0x3e	|	^	94	0136	0x5e	|	~	126	0176	0x7e
unit separator	31	0037	0x1f	|	?	63	0077	0x3f	|	_	95	0137	0x5f	|	delete	127	0177	0x7f

Note that lower and upper case characters are understood by the computer differently.