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ASCII Table

Every code from 0 to 127, and what each control character does

Control characters

Dec	Hex	Oct	Bin	Abbr	Caret	Escape	Name and what it does
0	00	000	0000000	NUL	^@	\0	null Nothing at all. Pads data, and ends a string in C.
1	01	001	0000001	SOH	^A		start of heading Began a message header on early data links.
2	02	002	0000010	STX	^B		start of text Ended a header and began the message body.
3	03	003	0000011	ETX	^C		end of text Ended the body. Ctrl-C sends it, and terminals make it an interrupt.
4	04	004	0000100	EOT	^D		end of transmission Ended a transmission. Ctrl-D at the start of a terminal line ends input.
5	05	005	0000101	ENQ	^E		enquiry Asked the far end to identify itself or report its status.
6	06	006	0000110	ACK	^F		acknowledge Answered yes: received correctly.
7	07	007	0000111	BEL	^G	\a	bell Rings the terminal bell, or flashes the screen.
8	08	010	0001000	BS	^H	\b	backspace Moves the cursor back one column; whether it erases is up to the terminal.
9	09	011	0001001	HT	^I	\t	horizontal tab Moves to the next tab stop.
10	0A	012	0001010	LF	^J	\n	line feed Moves down one line. On Unix it ends a line by itself.
11	0B	013	0001011	VT	^K	\v	vertical tab Moves down to the next vertical tab stop; rarely honoured.
12	0C	014	0001100	FF	^L	\f	form feed Starts a new page on a printer. Ctrl-L clears many terminal screens.
13	0D	015	0001101	CR	^M	\r	carriage return Moves to the start of the line. Windows ends a line with CR LF.
14	0E	016	0001110	SO	^N		shift out Switched to an alternate character set.
15	0F	017	0001111	SI	^O		shift in Switched back to the standard character set.
16	10	020	0010000	DLE	^P		data link escape Marked the characters after it as data, not control.
17	11	021	0010001	DC1	^Q		device control 1 XON: resume sending. Ctrl-Q unfreezes a terminal.
18	12	022	0010010	DC2	^R		device control 2 Left to the device to define.
19	13	023	0010011	DC3	^S		device control 3 XOFF: pause sending. Ctrl-S freezes a terminal.
20	14	024	0010100	DC4	^T		device control 4 Left to the device to define.
21	15	025	0010101	NAK	^U		negative acknowledge Answered no: received with errors.
22	16	026	0010110	SYN	^V		synchronous idle Kept a synchronous link in step while idle.
23	17	027	0010111	ETB	^W		end of transmission block Ended one block of a transmission.
24	18	030	0011000	CAN	^X		cancel Marked the data before it as in error, to be ignored.
25	19	031	0011001	EM	^Y		end of medium Marked the physical end of a tape or card.
26	1A	032	0011010	SUB	^Z		substitute Stood in for a garbled character. Ctrl-Z ends input on Windows and suspends a process on Unix.
27	1B	033	0011011	ESC	^[	\enot ISO C	escape Starts an escape sequence: what follows is a command, as in terminal colors.
28	1C	034	0011100	FS	^\		file separator Separated files, the largest unit of data.
29	1D	035	0011101	GS	^]		group separator Separated groups within a file.
30	1E	036	0011110	RS	^^		record separator Separated records within a group.
31	1F	037	0011111	US	^_		unit separator Separated units within a record, the smallest field.
127	7F	177	1111111	DEL	^?		delete Erased a character on paper tape by punching every hole. Many terminals send it for the Backspace key.

Printable characters

Char	Dec	Hex	Oct	Bin
space	32	20	040	0100000
!	33	21	041	0100001
"	34	22	042	0100010
#	35	23	043	0100011
$	36	24	044	0100100
%	37	25	045	0100101
&	38	26	046	0100110
'	39	27	047	0100111
(	40	28	050	0101000
)	41	29	051	0101001
*	42	2A	052	0101010
+	43	2B	053	0101011
,	44	2C	054	0101100
-	45	2D	055	0101101
.	46	2E	056	0101110
/	47	2F	057	0101111
0	48	30	060	0110000
1	49	31	061	0110001
2	50	32	062	0110010
3	51	33	063	0110011
4	52	34	064	0110100
5	53	35	065	0110101
6	54	36	066	0110110
7	55	37	067	0110111
8	56	38	070	0111000
9	57	39	071	0111001
:	58	3A	072	0111010
;	59	3B	073	0111011
<	60	3C	074	0111100
=	61	3D	075	0111101
>	62	3E	076	0111110
?	63	3F	077	0111111

Char	Dec	Hex	Oct	Bin
@	64	40	100	1000000
A	65	41	101	1000001
B	66	42	102	1000010
C	67	43	103	1000011
D	68	44	104	1000100
E	69	45	105	1000101
F	70	46	106	1000110
G	71	47	107	1000111
H	72	48	110	1001000
I	73	49	111	1001001
J	74	4A	112	1001010
K	75	4B	113	1001011
L	76	4C	114	1001100
M	77	4D	115	1001101
N	78	4E	116	1001110
O	79	4F	117	1001111
P	80	50	120	1010000
Q	81	51	121	1010001
R	82	52	122	1010010
S	83	53	123	1010011
T	84	54	124	1010100
U	85	55	125	1010101
V	86	56	126	1010110
W	87	57	127	1010111
X	88	58	130	1011000
Y	89	59	131	1011001
Z	90	5A	132	1011010
[	91	5B	133	1011011
\	92	5C	134	1011100
]	93	5D	135	1011101
^	94	5E	136	1011110
_	95	5F	137	1011111

Char	Dec	Hex	Oct	Bin
`	96	60	140	1100000
a	97	61	141	1100001
b	98	62	142	1100010
c	99	63	143	1100011
d	100	64	144	1100100
e	101	65	145	1100101
f	102	66	146	1100110
g	103	67	147	1100111
h	104	68	150	1101000
i	105	69	151	1101001
j	106	6A	152	1101010
k	107	6B	153	1101011
l	108	6C	154	1101100
m	109	6D	155	1101101
n	110	6E	156	1101110
o	111	6F	157	1101111
p	112	70	160	1110000
q	113	71	161	1110001
r	114	72	162	1110010
s	115	73	163	1110011
t	116	74	164	1110100
u	117	75	165	1110101
v	118	76	166	1110110
w	119	77	167	1110111
x	120	78	170	1111000
y	121	79	171	1111001
z	122	7A	172	1111010
{	123	7B	173	1111011
\|	124	7C	174	1111100
}	125	7D	175	1111101
~	126	7E	176	1111110

Codes and names as ANSI X3.4-1986 defines them. Escapes as C writes them; \e is not ISO C, but GCC, Clang and shells read it. Caret notation is how terminals echo a control key: the code with bit 6 flipped. ASCII stops at 127 — above it there is no single answer, since Latin-1, Windows-1252 and a dozen code pages each assign 128–255 differently.