7-bit ASCII Character Codes

2020-06-02

Development Linux Linux Utilities

The ASCII table, an abbreviation for American Standard Code for Information Interchange, utilizes a 7-bit character encoding system to represent 128 unique characters. These include both control and printable characters. The table is composed of 32 control characters (ranging from 0-31) used for text formatting management, and 96 printable characters (ranging from 32-127). The latter includes the English alphabet, digits, and common punctuation marks.

7-bit ASCII Character Codes

The ASCII table contains letters, numbers, control characters, and other symbols. Each character is assigned a unique 7-bit code. ASCII is an acronym for American Standard Code for Information Interchange.

Decimal	Octal	Hex	Binary	Value	Description	Carret notation	Escape sequence in C
000	000	00	0000 0000	NUL	"null" character	^@	\0
001	001	01	0000 0001	SOH	start of header	^A
002	002	02	0000 0010	STX	start of text	^B
003	003	03	0000 0011	ETX	end of text	^C
004	004	04	0000 0100	EOT	end of transmission	^D
005	005	05	0000 0101	ENQ	enquiry	^E
006	006	06	0000 0110	ACK	acknowledgment	^F
007	007	07	0000 0111	BEL	bell	^G	\a
008	010	08	0000 1000	BS	backspace	^H	\b
009	011	09	0000 1001	HT	horizontal tab	^I	\h
010	012	0A	0000 1010	LF	line feed	^J	\n
011	013	0B	0000 1011	VT	vertical tab	^K	\v
012	014	0C	0000 1100	FF	form feed	^L	\f
013	015	0D	0000 1101	CR	carriage return	^M	\r
014	016	0E	0000 1110	SO	shift out	^N
015	017	0F	0000 1111	SI	shift in	^O
016	020	10	0001 0000	DLE	data link escape	^P
017	021	11	0001 0001	DC1	device control 1 (XON)	^Q
018	022	12	0001 0010	DC2	device control 2	^R
019	023	13	0001 0011	DC3	device control 3 (XOFF)	^S
020	024	14	0001 0100	DC4	device control 4	^T
021	025	15	0001 0101	NAK	negative acknowledgement	^U
022	026	16	0001 0110	SYN	synchronous idle	^V
023	027	17	0001 0111	ETB	end of transmission block	^W
024	030	18	0001 1000	CAN	cancel	^X
025	031	19	0001 1001	EM	end of medium	^Y
026	032	1A	0001 1010	SUB	substitute	^Z
027	033	1B	0001 1011	ESC	escape	^[	\e
028	034	1C	0001 1100	FS	file separator	^\
029	035	1D	0001 1101	GS	group separator	^]
030	036	1E	0001 1110	RS	request to send/record separator	^^
031	037	1F	0001 1111	US	unit separator	^_
032	040	20	0010 0000	SP	space	^?
033	041	21	0010 0001	!	exclamation mark
034	042	22	0010 0010	"	double quote
035	043	23	0010 0011	#	number sign
036	044	24	0010 0100	$	dollar sign
037	045	25	0010 0101	%	percent
038	046	26	0010 0110	&	ampersand
039	047	27	0010 0111	'	single quote
040	050	28	0010 1000	(	left/opening parenthesis
041	051	29	0010 1001	)	right/closing parenthesis
042	052	2A	0010 1010	*	asterisk
043	053	2B	0010 1011	+	plus
044	054	2C	0010 1100	,	comma
045	055	2D	0010 1101	-	minus or dash
046	056	2E	0010 1110	.	dot
047	057	2F	0010 1111	/	forward slash
048	060	30	0011 0000	0
049	061	31	0011 0001	1
050	062	32	0011 0010	2
051	063	33	0011 0011	3
052	064	34	0011 0100	4
053	065	35	0011 0101	5
054	066	36	0011 0110	6
055	067	37	0011 0111	7
056	070	38	0011 1000	8
057	071	39	0011 1001	9
058	072	3A	0011 1010	:	colon
059	073	3B	0011 1011	;	semi-colon
060	074	3C	0011 1100	<	less than
061	075	3D	0011 1101	=	equal sign
062	076	3E	0011 1110	>	greater than
063	077	3F	0011 1111	?	question mark
064	100	40	0100 0000	@	'at' symbol
065	101	41	0100 0001	A
066	102	42	0100 0010	B
067	103	43	0100 0011	C
068	104	44	0100 0100	D
069	105	45	0100 0101	E
070	106	46	0100 0110	F
071	107	47	0100 0111	G
072	110	48	0100 1000	H
073	111	49	0100 1001	I
074	112	4A	0100 1010	J
075	113	4B	0100 1011	K
076	114	4C	0100 1100	L
077	115	4D	0100 1101	M
078	116	4E	0100 1110	N
079	117	4F	0100 1111	O
080	120	50	0101 0000	P
081	121	51	0101 0001	Q
082	122	52	0101 0010	R
083	123	53	0101 0011	S
084	124	54	0101 0100	T
085	125	55	0101 0101	U
086	126	56	0101 0110	V
087	127	57	0101 0111	W
088	130	58	0101 1000	X
089	131	59	0101 1001	Y
090	132	5A	0101 1010	Z
091	133	5B	0101 1011	[	left/opening bracket
092	134	5C	0101 1100	\	back slash
093	135	5D	0101 1101	]	right/closing bracket
094	136	5E	0101 1110	^	caret/circumflex
095	137	5F	0101 1111	_	underscore
096	140	60	0110 0000	`
097	141	61	0110 0001	a
098	142	62	0110 0010	b
099	143	63	0110 0011	c
100	144	64	0110 0100	d
101	145	65	0110 0101	e
102	146	66	0110 0110	f
103	147	67	0110 0111	g
104	150	68	0110 1000	h
105	151	69	0110 1001	i
106	152	6A	0110 1010	j
107	153	6B	0110 1011	k
108	154	6C	0110 1100	l
109	155	6D	0110 1101	m
110	156	6E	0110 1110	n
111	157	6F	0110 1111	o
112	160	70	0111 0000	p
113	161	71	0111 0001	q
114	162	72	0111 0010	r
115	163	73	0111 0011	s
116	164	74	0111 0100	t
117	165	75	0111 0101	u
118	166	76	0111 0110	v
119	167	77	0111 0111	w
120	170	78	0111 1000	x
121	171	79	0111 1001	y
122	172	7A	0111 1010	z
123	173	7B	0111 1011	{	left/opening brace
124	174	7C	0111 1100	\|	vertical bar
125	175	7D	0111 1101	}	right/closing brace
126	176	7E	0111 1110	~	tilde
127	177	7F	0111 1111	DEL	delete