ASCII Table

Date: 2022-10-16, Updated: 2024-08-05 — by Slatian

This ASCII-Table is mostly derived from the Unicode 15.0 Documentation.

Table of Contents

Mostly Printable Characters

Codes 0x20 to 0x7E are referred to as the printable characters, 0x7F is a control character. Wikipedia has more background information.

Numbers and Specials
Char	Hex	Dec
SPACE	20	32
!	21	33
"	22	34
#	23	35
$	24	36
%	25	37
&	26	38
'	27	39
(	28	40
)	29	41
*	2a	42
+	2b	43
,	2c	44
-	2d	45
.	2e	46
/	2f	47
0	30	48
1	31	49
2	32	50
3	33	51
4	34	52
5	35	53
6	36	54
7	37	55
8	38	56
9	39	57
:	3a	58
;	3b	59
<	3c	60
=	3d	61
>	3e	62
?	3f	63

Uppercase
Char	Hex	Dec
@	40	64
A	41	65
B	42	66
C	43	67
D	44	68
E	45	69
F	46	70
G	47	71
H	48	72
I	49	73
J	4a	74
K	4b	75
L	4c	76
M	4d	77
N	4e	78
O	4f	79
P	50	80
Q	51	81
R	52	82
S	53	83
T	54	84
U	55	85
V	56	86
W	57	87
X	58	88
Y	59	89
Z	5a	90
[	5b	91
\	5c	92
]	5d	93
^	5e	94
_	5f	95

Lowercase
Char	Hex	Dec
`	60	96
a	61	97
b	62	98
c	63	99
d	64	100
e	65	101
f	66	102
g	67	103
h	68	104
i	69	105
j	6a	106
k	6b	107
l	6c	108
m	6d	109
n	6e	110
o	6f	111
p	70	112
q	71	113
r	72	114
s	73	115
t	74	116
u	75	117
v	76	118
w	77	119
x	78	120
y	79	121
z	7a	122
{	7b	123
\|	7c	124
}	7d	125
~	7e	126
DEL	7f	127

Note on the DEL code:The DEL being 0x7F, meaning it has all 7 bits set, probably originates from how one "deleted" something from paper tape, by just punching all of the holes one could "erase" the original character. Its meaning is ambigious, but it usually refers to a backspace.

Fun Fact: The lowercase characters in ASCII were an "aftertought" and only added later in 1965, two years after the initial release.

Control characters

Char	Hex	Oct	Dec	Name	C Esc
NUL	00	000	0	Null
SOH	01	001	1	Start Of Heading
STX	02	002	2	Start Of Text
ETX	03	003	3	End Of Text
EOT	04	004	4	End Of Transmission
ENQ	05	005	5	Enquiry
ACK	06	006	6	Acknowledge
BEL	07	007	7	Bell / Alert	`\a`
BS	08	010	8	BAckspace
HT	09	011	9	HOrizontal Tab	`\t`
LF	0a	012	10	Line Feed	`\n`
VT	0b	013	11	Vertical Tab	`\v`
FF	0c	014	12	Form Feed	`\f`
CR	0d	015	13	Carriage Return	`\r`
SO	0e	016	14	Shift Out
SI	0f	017	15	Shift In
DLE	10	020	16	Data Link Escape
DC1	11	021	17	Device Control 1
DC2	12	022	18	Device Control 2
DC3	13	023	19	Device Control 3
DC4	14	024	20	Device Control 4
NAK	15	025	21	Negative Acknowledge
SYN	16	026	22	Synchronous Idle
ETB	17	027	23	End Of Transmission Block
CAN	18	030	24	Cancel
EM	19	031	25	End Of Medium
SUB	1a	032	26	Substitute
ESC	1b	033	27	Escape	`\e`
FS	1c	034	28	File Seperator
GS	1d	035	29	Group Seperator
RS	1e	036	30	Record Seperator
US	1f	037	31	Unit Seperator

Note: The Names have been titlecased to make them easier to read.

Notation

Escaping in Scripting and Programming

Sometimes in languages one can't use all the characters available in the source file, especially when using control characters. Encoding these as other characters is called escaping. This usually happens with text between double quotes ".

There are differences between languages and implementations but the general rules are:

Special characters preceeded by a backslash \ are taken literally. (i.e. \" or \\) (The exact behaviour varies a lot by language.)
Latin characters preceeded by a backslash to generate control characters (i.e. \n) (The C Esc column)
Hexadecimal value of the character prefixed by \x (i.e. 0x1b) (should work almost everywhere)
Octal encoding prefixed by just a backslash (i.e. \033) (Use this when using printf on the command line)

Note: C Esc here is short C-Escape as the C language apparantly started this way of excaping characters in strings. It is now used by almost all modern languages and in other contexts. i.e. printf, sed, etc. exact support may vary.

Escaping in XML and HTML

XML and html have their own way of escaping non-printable characters, this involves a sequence sandwiched between an ampersand & and a semicolon ;.

In general Characters can be escaped using &#<dec>; where <dec> is replaced by the decimal value associted with the character. (i.e, & to encode an ampersand &)

There are also named escapes to make remembering them easier:

Character	XML-escape
`&`	`&`
`<`	`<`
`>`	`>`
`"`	`"`

Control and Shift

With the ASCII table control and shift keys an be implemented using simple addition and substraction.

The lowercase character can be obtained by adding 32 (0x20) to the code of the corresponding uppercase character and the control key goes 64 (0x40) in the opposite direction.

With that ctrl+c maps to code 3 "End of Text". And ctrl+d maps to "End of Transmission". You may know those shortcuts from the terminal, they hopefully make a bit more sense now.

Control characters are sometimes written down/printed as the character one gets when adding 64 to the control characters value prefixed by an ^.

This maps escape to ^] and the nullbyte to ^@. (You have probably seen those when opening a binary file in a text editor.)

Unicode

Creating a unicode table andkeeping it updated is out of scope here, besides that: Wikipedia has a List of Unicode Characters and there are the offical Unicode Character Code Charts. (Plus a whole lot of other unicode tables out there.)

Notation Hint: Unicode codepoints (that is the number assigned in the unicode standard, not the binary character representation) are written U+<hex> where <hex> is the codepint number in hexadecimal. Example: U+1f603 for 😃.

There is also a little commandline tool called uni, that is pretty good at providing a searchable unicode table.

Char	Hex	Dec
@	40	64
A	41	65
B	42	66
C	43	67
D	44	68
E	45	69
F	46	70
G	47	71
H	48	72
I	49	73
J	4a	74
K	4b	75
L	4c	76
M	4d	77
N	4e	78
O	4f	79
P	50	80
Q	51	81
R	52	82
S	53	83
T	54	84
U	55	85
V	56	86
W	57	87
X	58	88
Y	59	89
Z	5a	90
[	5b	91
\	5c	92
]	5d	93
^	5e	94
_	5f	95

Char	Hex	Dec
`	60	96
a	61	97
b	62	98
c	63	99
d	64	100
e	65	101
f	66	102
g	67	103
h	68	104
i	69	105
j	6a	106
k	6b	107
l	6c	108
m	6d	109
n	6e	110
o	6f	111
p	70	112
q	71	113
r	72	114
s	73	115
t	74	116
u	75	117
v	76	118
w	77	119
x	78	120
y	79	121
z	7a	122
{	7b	123
\|	7c	124
}	7d	125
~	7e	126
DEL	7f	127

Char	Hex	Dec
@	40	64
A	41	65
B	42	66
C	43	67
D	44	68
E	45	69
F	46	70
G	47	71
H	48	72
I	49	73
J	4a	74
K	4b	75
L	4c	76
M	4d	77
N	4e	78
O	4f	79
P	50	80
Q	51	81
R	52	82
S	53	83
T	54	84
U	55	85
V	56	86
W	57	87
X	58	88
Y	59	89
Z	5a	90
[	5b	91
\	5c	92
]	5d	93
^	5e	94
_	5f	95

Char	Hex	Dec
`	60	96
a	61	97
b	62	98
c	63	99
d	64	100
e	65	101
f	66	102
g	67	103
h	68	104
i	69	105
j	6a	106
k	6b	107
l	6c	108
m	6d	109
n	6e	110
o	6f	111
p	70	112
q	71	113
r	72	114
s	73	115
t	74	116
u	75	117
v	76	118
w	77	119
x	78	120
y	79	121
z	7a	122
{	7b	123
\|	7c	124
}	7d	125
~	7e	126
DEL	7f	127

Char	Hex	Dec
@	40	64
A	41	65
B	42	66
C	43	67
D	44	68
E	45	69
F	46	70
G	47	71
H	48	72
I	49	73
J	4a	74
K	4b	75
L	4c	76
M	4d	77
N	4e	78
O	4f	79
P	50	80
Q	51	81
R	52	82
S	53	83
T	54	84
U	55	85
V	56	86
W	57	87
X	58	88
Y	59	89
Z	5a	90
[	5b	91
\	5c	92
]	5d	93
^	5e	94
_	5f	95

Char	Hex	Dec
`	60	96
a	61	97
b	62	98
c	63	99
d	64	100
e	65	101
f	66	102
g	67	103
h	68	104
i	69	105
j	6a	106
k	6b	107
l	6c	108
m	6d	109
n	6e	110
o	6f	111
p	70	112
q	71	113
r	72	114
s	73	115
t	74	116
u	75	117
v	76	118
w	77	119
x	78	120
y	79	121
z	7a	122
{	7b	123
\|	7c	124
}	7d	125
~	7e	126
DEL	7f	127