ASCII Table: Codes 0-127 in Hex, Octal, Binary, Decimal

All 128 ASCII codes with decimal, hex, octal, binary, HTML entity, character and control-code names such as LF Line Feed. Filter by class, sort any column, view Windows-1252 128 to 255, copy as text or CSV. Nothing is uploaded.

128 of 128 codes

ASCII codes 0 to 127

0	00	000	0000000			NUL	Null
1	01	001	0000001			SOH	Start of Heading
2	02	002	0000010			STX	Start of Text
3	03	003	0000011			ETX	End of Text
4	04	004	0000100			EOT	End of Transmission
5	05	005	0000101			ENQ	Enquiry
6	06	006	0000110			ACK	Acknowledge
7	07	007	0000111			BEL	Bell
8	08	010	0001000			BS	Backspace
9	09	011	0001001			HT	Horizontal Tab
10	0A	012	0001010			LF	Line Feed
11	0B	013	0001011			VT	Vertical Tab
12	0C	014	0001100			FF	Form Feed
13	0D	015	0001101			CR	Carriage Return
14	0E	016	0001110			SO	Shift Out
15	0F	017	0001111			SI	Shift In
16	10	020	0010000			DLE	Data Link Escape
17	11	021	0010001			DC1	Device Control 1 (XON)
18	12	022	0010010			DC2	Device Control 2
19	13	023	0010011			DC3	Device Control 3 (XOFF)
20	14	024	0010100			DC4	Device Control 4
21	15	025	0010101			NAK	Negative Acknowledge
22	16	026	0010110			SYN	Synchronous Idle
23	17	027	0010111			ETB	End of Transmission Block
24	18	030	0011000			CAN	Cancel
25	19	031	0011001			EM	End of Medium
26	1A	032	0011010			SUB	Substitute
27	1B	033	0011011			ESC	Escape
28	1C	034	0011100			FS	File Separator
29	1D	035	0011101			GS	Group Separator
30	1E	036	0011110			RS	Record Separator
31	1F	037	0011111			US	Unit Separator
32	20	040	0100000			SP	Space
33	21	041	0100001	!	!		Exclamation mark
34	22	042	0100010	"	"		Quotation mark
35	23	043	0100011	#	#		Number sign
36	24	044	0100100	$	$		Dollar sign
37	25	045	0100101	%	%		Percent sign
38	26	046	0100110	&	&		Ampersand
39	27	047	0100111	'	'		Apostrophe
40	28	050	0101000	(	(		Left parenthesis
41	29	051	0101001	)	)		Right parenthesis
42	2A	052	0101010	*	*		Asterisk
43	2B	053	0101011	+	+		Plus sign
44	2C	054	0101100	,	,		Comma
45	2D	055	0101101	-	-		Hyphen-minus
46	2E	056	0101110	.	.		Full stop
47	2F	057	0101111	/	/		Solidus (slash)
48	30	060	0110000	0	0		Digit zero
49	31	061	0110001	1	1		Digit one
50	32	062	0110010	2	2		Digit two
51	33	063	0110011	3	3		Digit three
52	34	064	0110100	4	4		Digit four
53	35	065	0110101	5	5		Digit five
54	36	066	0110110	6	6		Digit six
55	37	067	0110111	7	7		Digit seven
56	38	070	0111000	8	8		Digit eight
57	39	071	0111001	9	9		Digit nine
58	3A	072	0111010	:	:		Colon
59	3B	073	0111011	;	;		Semicolon
60	3C	074	0111100	<	<		Less-than sign
61	3D	075	0111101	=	=		Equals sign
62	3E	076	0111110	>	>		Greater-than sign
63	3F	077	0111111	?	?		Question mark
64	40	100	1000000	@	@		Commercial at
65	41	101	1000001	A	A		Latin capital letter A
66	42	102	1000010	B	B		Latin capital letter B
67	43	103	1000011	C	C		Latin capital letter C
68	44	104	1000100	D	D		Latin capital letter D
69	45	105	1000101	E	E		Latin capital letter E
70	46	106	1000110	F	F		Latin capital letter F
71	47	107	1000111	G	G		Latin capital letter G
72	48	110	1001000	H	H		Latin capital letter H
73	49	111	1001001	I	I		Latin capital letter I
74	4A	112	1001010	J	J		Latin capital letter J
75	4B	113	1001011	K	K		Latin capital letter K
76	4C	114	1001100	L	L		Latin capital letter L
77	4D	115	1001101	M	M		Latin capital letter M
78	4E	116	1001110	N	N		Latin capital letter N
79	4F	117	1001111	O	O		Latin capital letter O
80	50	120	1010000	P	P		Latin capital letter P
81	51	121	1010001	Q	Q		Latin capital letter Q
82	52	122	1010010	R	R		Latin capital letter R
83	53	123	1010011	S	S		Latin capital letter S
84	54	124	1010100	T	T		Latin capital letter T
85	55	125	1010101	U	U		Latin capital letter U
86	56	126	1010110	V	V		Latin capital letter V
87	57	127	1010111	W	W		Latin capital letter W
88	58	130	1011000	X	X		Latin capital letter X
89	59	131	1011001	Y	Y		Latin capital letter Y
90	5A	132	1011010	Z	Z		Latin capital letter Z
91	5B	133	1011011	[	[		Left square bracket
92	5C	134	1011100	\	\		Reverse solidus (backslash)
93	5D	135	1011101	]	]		Right square bracket
94	5E	136	1011110	^	^		Circumflex accent
95	5F	137	1011111	_	_		Low line (underscore)
96	60	140	1100000	`	`		Grave accent (backtick)
97	61	141	1100001	a	a		Latin small letter a
98	62	142	1100010	b	b		Latin small letter b
99	63	143	1100011	c	c		Latin small letter c
100	64	144	1100100	d	d		Latin small letter d
101	65	145	1100101	e	e		Latin small letter e
102	66	146	1100110	f	f		Latin small letter f
103	67	147	1100111	g	g		Latin small letter g
104	68	150	1101000	h	h		Latin small letter h
105	69	151	1101001	i	i		Latin small letter i
106	6A	152	1101010	j	j		Latin small letter j
107	6B	153	1101011	k	k		Latin small letter k
108	6C	154	1101100	l	l		Latin small letter l
109	6D	155	1101101	m	m		Latin small letter m
110	6E	156	1101110	n	n		Latin small letter n
111	6F	157	1101111	o	o		Latin small letter o
112	70	160	1110000	p	p		Latin small letter p
113	71	161	1110001	q	q		Latin small letter q
114	72	162	1110010	r	r		Latin small letter r
115	73	163	1110011	s	s		Latin small letter s
116	74	164	1110100	t	t		Latin small letter t
117	75	165	1110101	u	u		Latin small letter u
118	76	166	1110110	v	v		Latin small letter v
119	77	167	1110111	w	w		Latin small letter w
120	78	170	1111000	x	x		Latin small letter x
121	79	171	1111001	y	y		Latin small letter y
122	7A	172	1111010	z	z		Latin small letter z
123	7B	173	1111011	{	{		Left curly bracket
124	7C	174	1111100	\|	\|		Vertical line
125	7D	175	1111101	}	}		Right curly bracket
126	7E	176	1111110	~	~		Tilde
127	7F	177	1111111			DEL	Delete

About the ASCII Table

The ASCII Table lists all 128 codes of the American Standard Code for Information Interchange, from 0 to 127, with each code written in decimal, hexadecimal, octal and 7-bit binary, its HTML character reference, the character itself, and, for the 33 control codes, the standard abbreviation and name. For example, code 10 is 0x0A, octal 012, binary 0001010: the control code LF, Line Feed, which ends a line on Unix, Linux and macOS. Code 65 is 0x41, the capital letter A.

Use the filters to show only control codes, printable characters, letters, digits or punctuation, and press any column heading to sort by that column; press it again to reverse the order. Copy as text gives a table aligned with spaces for notes and code comments, Copy as CSV gives a header row and one row per code for a spreadsheet, and Download .csv saves the same file. The table is built in your browser and nothing is sent anywhere.

How ASCII is organised

Control codes, 0 to 31 and 127

The first 32 codes and code 127 do not print a character. They were designed to control teleprinters and data links: BEL (7) rang a bell, BS (8) moved back one column, HT (9) jumped to the next tab stop, LF (10) fed the paper one line, CR (13) returned the print head to the start of the line, and ESC (27) introduced a command sequence. Today LF and CR mark line ends (Windows uses the pair CR LF), HT is the tab character, and ESC still starts the ANSI escape sequences that colour terminal output. DEL (127) is all seven bits set, because punching every hole in paper tape erased a character.

Printable characters, 32 to 126

Code 32 is the space. Then come punctuation and symbols, the digits 0 to 9 at 48 to 57, the capitals A to Z at 65 to 90 and the small letters a to z at 97 to 122, with more punctuation between and after the letter blocks. Small and capital letters differ by exactly 32, a single bit, which is why changing case in ASCII is a matter of flipping bit 5. The digits sit at 0x30 to 0x39, so the low four bits of a digit's code are its value.

Codes 128 to 255 are not ASCII

ASCII is a 7-bit code and ends at 127. Byte values from 128 to 255 mean different things in different encodings: Windows-1252, ISO-8859-1, the old DOS code page 437 and many others. Turn on Show Windows-1252 128 to 255 to see the most common of these, the Western European Windows code page, in a separate table. Its name column gives the Unicode code point each byte stands for, such as 0x80 for the euro sign € (U+20AC). In UTF-8 those byte values only ever occur inside multi-byte sequences, so a lone byte such as 0xE9 is not valid UTF-8 at all.

Reference table

The table below is the same data as the tool, rendered as a static page for printing or reading without JavaScript.

ASCII codes 0 to 127
Decimal	Hex	Octal	Binary	HTML entity	Character	Abbreviation	Name
0	00	000	0000000			NUL	Null
1	01	001	0000001			SOH	Start of Heading
2	02	002	0000010			STX	Start of Text
3	03	003	0000011			ETX	End of Text
4	04	004	0000100			EOT	End of Transmission
5	05	005	0000101			ENQ	Enquiry
6	06	006	0000110			ACK	Acknowledge
7	07	007	0000111			BEL	Bell
8	08	010	0001000			BS	Backspace
9	09	011	0001001			HT	Horizontal Tab
10	0A	012	0001010			LF	Line Feed
11	0B	013	0001011			VT	Vertical Tab
12	0C	014	0001100			FF	Form Feed
13	0D	015	0001101			CR	Carriage Return
14	0E	016	0001110			SO	Shift Out
15	0F	017	0001111			SI	Shift In
16	10	020	0010000			DLE	Data Link Escape
17	11	021	0010001			DC1	Device Control 1 (XON)
18	12	022	0010010			DC2	Device Control 2
19	13	023	0010011			DC3	Device Control 3 (XOFF)
20	14	024	0010100			DC4	Device Control 4
21	15	025	0010101			NAK	Negative Acknowledge
22	16	026	0010110			SYN	Synchronous Idle
23	17	027	0010111			ETB	End of Transmission Block
24	18	030	0011000			CAN	Cancel
25	19	031	0011001			EM	End of Medium
26	1A	032	0011010			SUB	Substitute
27	1B	033	0011011			ESC	Escape
28	1C	034	0011100			FS	File Separator
29	1D	035	0011101			GS	Group Separator
30	1E	036	0011110			RS	Record Separator
31	1F	037	0011111			US	Unit Separator
32	20	040	0100000			SP	Space
33	21	041	0100001	!	!		Exclamation mark
34	22	042	0100010	"	"		Quotation mark
35	23	043	0100011	#	#		Number sign
36	24	044	0100100	$	$		Dollar sign
37	25	045	0100101	%	%		Percent sign
38	26	046	0100110	&	&		Ampersand
39	27	047	0100111	'	'		Apostrophe
40	28	050	0101000	(	(		Left parenthesis
41	29	051	0101001	)	)		Right parenthesis
42	2A	052	0101010	*	*		Asterisk
43	2B	053	0101011	+	+		Plus sign
44	2C	054	0101100	,	,		Comma
45	2D	055	0101101	-	-		Hyphen-minus
46	2E	056	0101110	.	.		Full stop
47	2F	057	0101111	/	/		Solidus (slash)
48	30	060	0110000	0	0		Digit zero
49	31	061	0110001	1	1		Digit one
50	32	062	0110010	2	2		Digit two
51	33	063	0110011	3	3		Digit three
52	34	064	0110100	4	4		Digit four
53	35	065	0110101	5	5		Digit five
54	36	066	0110110	6	6		Digit six
55	37	067	0110111	7	7		Digit seven
56	38	070	0111000	8	8		Digit eight
57	39	071	0111001	9	9		Digit nine
58	3A	072	0111010	:	:		Colon
59	3B	073	0111011	;	;		Semicolon
60	3C	074	0111100	<	<		Less-than sign
61	3D	075	0111101	=	=		Equals sign
62	3E	076	0111110	>	>		Greater-than sign
63	3F	077	0111111	?	?		Question mark
64	40	100	1000000	@	@		Commercial at
65	41	101	1000001	A	A		Latin capital letter A
66	42	102	1000010	B	B		Latin capital letter B
67	43	103	1000011	C	C		Latin capital letter C
68	44	104	1000100	D	D		Latin capital letter D
69	45	105	1000101	E	E		Latin capital letter E
70	46	106	1000110	F	F		Latin capital letter F
71	47	107	1000111	G	G		Latin capital letter G
72	48	110	1001000	H	H		Latin capital letter H
73	49	111	1001001	I	I		Latin capital letter I
74	4A	112	1001010	J	J		Latin capital letter J
75	4B	113	1001011	K	K		Latin capital letter K
76	4C	114	1001100	L	L		Latin capital letter L
77	4D	115	1001101	M	M		Latin capital letter M
78	4E	116	1001110	N	N		Latin capital letter N
79	4F	117	1001111	O	O		Latin capital letter O
80	50	120	1010000	P	P		Latin capital letter P
81	51	121	1010001	Q	Q		Latin capital letter Q
82	52	122	1010010	R	R		Latin capital letter R
83	53	123	1010011	S	S		Latin capital letter S
84	54	124	1010100	T	T		Latin capital letter T
85	55	125	1010101	U	U		Latin capital letter U
86	56	126	1010110	V	V		Latin capital letter V
87	57	127	1010111	W	W		Latin capital letter W
88	58	130	1011000	X	X		Latin capital letter X
89	59	131	1011001	Y	Y		Latin capital letter Y
90	5A	132	1011010	Z	Z		Latin capital letter Z
91	5B	133	1011011	[	[		Left square bracket
92	5C	134	1011100	\	\		Reverse solidus (backslash)
93	5D	135	1011101	]	]		Right square bracket
94	5E	136	1011110	^	^		Circumflex accent
95	5F	137	1011111	_	_		Low line (underscore)
96	60	140	1100000	`	`		Grave accent (backtick)
97	61	141	1100001	a	a		Latin small letter a
98	62	142	1100010	b	b		Latin small letter b
99	63	143	1100011	c	c		Latin small letter c
100	64	144	1100100	d	d		Latin small letter d
101	65	145	1100101	e	e		Latin small letter e
102	66	146	1100110	f	f		Latin small letter f
103	67	147	1100111	g	g		Latin small letter g
104	68	150	1101000	h	h		Latin small letter h
105	69	151	1101001	i	i		Latin small letter i
106	6A	152	1101010	j	j		Latin small letter j
107	6B	153	1101011	k	k		Latin small letter k
108	6C	154	1101100	l	l		Latin small letter l
109	6D	155	1101101	m	m		Latin small letter m
110	6E	156	1101110	n	n		Latin small letter n
111	6F	157	1101111	o	o		Latin small letter o
112	70	160	1110000	p	p		Latin small letter p
113	71	161	1110001	q	q		Latin small letter q
114	72	162	1110010	r	r		Latin small letter r
115	73	163	1110011	s	s		Latin small letter s
116	74	164	1110100	t	t		Latin small letter t
117	75	165	1110101	u	u		Latin small letter u
118	76	166	1110110	v	v		Latin small letter v
119	77	167	1110111	w	w		Latin small letter w
120	78	170	1111000	x	x		Latin small letter x
121	79	171	1111001	y	y		Latin small letter y
122	7A	172	1111010	z	z		Latin small letter z
123	7B	173	1111011	{	{		Left curly bracket
124	7C	174	1111100	\|	\|		Vertical line
125	7D	175	1111101	}	}		Right curly bracket
126	7E	176	1111110	~	~		Tilde
127	7F	177	1111111			DEL	Delete

Related tools

To turn text into these codes, or codes back into text, in binary, octal, decimal or hex, use Text to Binary. For HTML character references beyond the five named ones in ASCII, the HTML Entity Encoder and Decoder covers the full HTML5 list. Numbers in other bases can be converted with the Number Base Converter.

Open-source credits

The table is implemented in-house on this site. The codes, abbreviations and names follow ANSI X3.4-1986 (US-ASCII), also published as RFC 20 and ISO/IEC 646. The extended view follows the windows-1252 index of the WHATWG Encoding Standard, and the HTML references follow the WHATWG HTML standard.

Frequently asked questions

Why does ASCII have only 128 codes?

ASCII was standardised in the 1960s as a 7-bit code, and seven bits give exactly 128 values, from 0 to 127. The eighth bit of a byte was left for parity checking on noisy lines. Codes from 128 to 255 belong to later 8-bit encodings such as Windows-1252, not to ASCII.

What is the difference between LF and CR?

LF (Line Feed, code 10) moved a teleprinter's paper up one line and CR (Carriage Return, code 13) moved the print head back to the left margin. Unix, Linux and macOS end lines with LF alone, Windows uses CR followed by LF, and classic Mac OS used CR alone.

Why do capital and small letters differ by 32?

The designers placed the two alphabets exactly 32 codes apart so that they differ in a single bit, bit 5. Hardware and software could change case by setting or clearing that one bit: A is 65 (0x41) and a is 97 (0x61).

Is code 127 a printable character?

No. Code 127 is DEL, Delete, a control code with all seven bits set. On paper tape a mistyped character was erased by punching every hole over it, so the all-ones pattern came to mean 'ignore this character'. It prints nothing in most programs today.

Which characters have named HTML entities in ASCII?

Five do: the quotation mark ("), the ampersand (&), the apostrophe ('), the less-than sign (<) and the greater-than sign (>). Every other ASCII character can be written as a numeric reference such as A for A, which this table shows in its HTML entity column.

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