ASCII Table: All 128 Codes in Decimal, Hex, Octal and Binary

0-127

The ASCII table

Dec	Hex	Oct	Binary	Char	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 Tabulation
10	0A	012	0001010	LF	Line Feed
11	0B	013	0001011	VT	Vertical Tabulation
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
18	12	022	0010010	DC2	Device Control 2
19	13	023	0010011	DC3	Device Control 3
20	14	024	0010100	DC4	Device Control 4 (Stop)
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
48	30	060	0110000	0	Digit zero
49	31	061	0110001	1	Digit one
50	32	062	0110010	2	Digit two
51	33	063	0110011	3	Digit three
52	34	064	0110100	4	Digit four
53	35	065	0110101	5	Digit five
54	36	066	0110110	6	Digit six
55	37	067	0110111	7	Digit seven
56	38	070	0111000	8	Digit eight
57	39	071	0111001	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	Capital A
66	42	102	1000010	B	Capital B
67	43	103	1000011	C	Capital C
68	44	104	1000100	D	Capital D
69	45	105	1000101	E	Capital E
70	46	106	1000110	F	Capital F
71	47	107	1000111	G	Capital G
72	48	110	1001000	H	Capital H
73	49	111	1001001	I	Capital I
74	4A	112	1001010	J	Capital J
75	4B	113	1001011	K	Capital K
76	4C	114	1001100	L	Capital L
77	4D	115	1001101	M	Capital M
78	4E	116	1001110	N	Capital N
79	4F	117	1001111	O	Capital O
80	50	120	1010000	P	Capital P
81	51	121	1010001	Q	Capital Q
82	52	122	1010010	R	Capital R
83	53	123	1010011	S	Capital S
84	54	124	1010100	T	Capital T
85	55	125	1010101	U	Capital U
86	56	126	1010110	V	Capital V
87	57	127	1010111	W	Capital W
88	58	130	1011000	X	Capital X
89	59	131	1011001	Y	Capital Y
90	5A	132	1011010	Z	Capital Z
91	5B	133	1011011	[	Left square bracket
92	5C	134	1011100	\	Reverse solidus
93	5D	135	1011101	]	Right square bracket
94	5E	136	1011110	^	Circumflex accent
95	5F	137	1011111	_	Low line
96	60	140	1100000	`	Grave accent
97	61	141	1100001	a	Small a
98	62	142	1100010	b	Small b
99	63	143	1100011	c	Small c
100	64	144	1100100	d	Small d
101	65	145	1100101	e	Small e
102	66	146	1100110	f	Small f
103	67	147	1100111	g	Small g
104	68	150	1101000	h	Small h
105	69	151	1101001	i	Small i
106	6A	152	1101010	j	Small j
107	6B	153	1101011	k	Small k
108	6C	154	1101100	l	Small l
109	6D	155	1101101	m	Small m
110	6E	156	1101110	n	Small n
111	6F	157	1101111	o	Small o
112	70	160	1110000	p	Small p
113	71	161	1110001	q	Small q
114	72	162	1110010	r	Small r
115	73	163	1110011	s	Small s
116	74	164	1110100	t	Small t
117	75	165	1110101	u	Small u
118	76	166	1110110	v	Small v
119	77	167	1110111	w	Small w
120	78	170	1111000	x	Small x
121	79	171	1111001	y	Small y
122	7A	172	1111010	z	Small 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

The ASCII tablestringmash.com/ascii-table

Reading the table

Each row is one code. Dec is the number most programming languages print, Hex is how it appears in a hex dump or a URL escape like %41, and Oct is what older Unix tools and C escapes like \101 use. Binary is the seven bits themselves.

The first 32 codes and the last one are control characters. They move a printer or a cursor, or mark the edges of a message, and they print nothing. The names come from the 1968 standard, USAS X3.4-1968, which RFC 20 copied out for the ARPANET in 1969. 32 is the space, and 33 to 126 are the characters you can type.

To look up your own text, type it in the converter above. Base switches between decimal, hex and octal, and swap reads codes back into text.

Why DEL is 127

Most control characters sit at the start of the table, but DEL is alone at the end, and it's there because of paper tape. 127 is 1111111 in binary, all seven bits set. A set bit was a punched hole, and a hole can't be un-punched.

So a mistake was fixed by punching out every hole over it. Whatever character had been there, it was now 127, and the machine reading the tape knew to skip it. RFC 20 describes DEL as used to "erase" or "obliterate" unwanted characters in perforated tape, and adds that in the strict sense it isn't a control character at all.

The document that brought ASCII to the internet

RFC 20, "ASCII format for Network Interchange", is dated 16 October 1969 and signed Vint Cerf, then at UCLA. It proposed standard 7-bit ASCII inside an 8-bit byte whose top bit was always 0, and the table it attached was copied from the 1968 American standard.

It's two pages long, and it shows why a standard was needed. SRI, it notes, used a full stop as its end-of-line character, while UCLA used carriage return, code 13. The line-ending argument between systems is still going.

Related conversions

ASCII to text converts whole messages both ways with the same codes. The binary translator shows the bits for any text, and the Unicode converter covers everything beyond 127, where ASCII stops.

Questions

What is the ASCII code for A?

65 in decimal, 41 in hex, 101 in octal and 1000001 in binary. Lowercase a is 97, exactly 32 higher, and every lowercase letter is 32 above its capital.

How many characters are in ASCII?

128, numbered 0 to 127, because it uses seven bits. 33 are control codes and 95 are printable, counting the space.

What is the difference between ASCII and Unicode?

ASCII covers 128 characters, enough for English. Unicode covers over 150,000, and its first 128 are ASCII, code for code, so every ASCII file is also valid UTF-8.

What are ASCII codes 128 to 255?

Not ASCII. Codes above 127 belong to 8-bit extensions like ISO-8859-1 and Windows-1252, which disagree with each other, so text read with the wrong one comes out garbled.