ASCII Table: Decimal, Hex, and Character Reference

ASCII (American Standard Code for Information Interchange) maps the numbers 0–127 to characters — the foundation every modern encoding, including UTF-8, is built on. Codes 0–31 and 127 are non-printable control characters; 32–126 are the printable letters, digits, and symbols. Here they are with their decimal, hexadecimal, and binary values.

Updated 2026-07-06

Dec	Hex	Binary	Char	Description
0	00	00000000	NUL	Null (control character)
1	01	00000001	SOH	Start of Heading (control character)
2	02	00000010	STX	Start of Text (control character)
3	03	00000011	ETX	End of Text (control character)
4	04	00000100	EOT	End of Transmission (control character)
5	05	00000101	ENQ	Enquiry (control character)
6	06	00000110	ACK	Acknowledge (control character)
7	07	00000111	BEL	Bell / alert (control character)
8	08	00001000	BS	Backspace (control character)
9	09	00001001	HT	Horizontal Tab (control character)
10	0A	00001010	LF	Line Feed (newline) (control character)
11	0B	00001011	VT	Vertical Tab (control character)
12	0C	00001100	FF	Form Feed (control character)
13	0D	00001101	CR	Carriage Return (control character)
14	0E	00001110	SO	Shift Out (control character)
15	0F	00001111	SI	Shift In (control character)
16	10	00010000	DLE	Data Link Escape (control character)
17	11	00010001	DC1	Device Control 1 (XON) (control character)
18	12	00010010	DC2	Device Control 2 (control character)
19	13	00010011	DC3	Device Control 3 (XOFF) (control character)
20	14	00010100	DC4	Device Control 4 (control character)
21	15	00010101	NAK	Negative Acknowledge (control character)
22	16	00010110	SYN	Synchronous Idle (control character)
23	17	00010111	ETB	End of Transmission Block (control character)
24	18	00011000	CAN	Cancel (control character)
25	19	00011001	EM	End of Medium (control character)
26	1A	00011010	SUB	Substitute (control character)
27	1B	00011011	ESC	Escape (control character)
28	1C	00011100	FS	File Separator (control character)
29	1D	00011101	GS	Group Separator (control character)
30	1E	00011110	RS	Record Separator (control character)
31	1F	00011111	US	Unit Separator (control character)
32	20	00100000	SP	Space
33	21	00100001	!	Punctuation / symbol
34	22	00100010	"	Punctuation / symbol
35	23	00100011	#	Punctuation / symbol
36	24	00100100	$	Punctuation / symbol
37	25	00100101	%	Punctuation / symbol
38	26	00100110	&	Punctuation / symbol
39	27	00100111	'	Punctuation / symbol
40	28	00101000	(	Punctuation / symbol
41	29	00101001	)	Punctuation / symbol
42	2A	00101010	*	Punctuation / symbol
43	2B	00101011	+	Punctuation / symbol
44	2C	00101100	,	Punctuation / symbol
45	2D	00101101	-	Punctuation / symbol
46	2E	00101110	.	Punctuation / symbol
47	2F	00101111	/	Punctuation / symbol
48	30	00110000	0	Digit
49	31	00110001	1	Digit
50	32	00110010	2	Digit
51	33	00110011	3	Digit
52	34	00110100	4	Digit
53	35	00110101	5	Digit
54	36	00110110	6	Digit
55	37	00110111	7	Digit
56	38	00111000	8	Digit
57	39	00111001	9	Digit
58	3A	00111010	:	Punctuation / symbol
59	3B	00111011	;	Punctuation / symbol
60	3C	00111100	<	Punctuation / symbol
61	3D	00111101	=	Punctuation / symbol
62	3E	00111110	>	Punctuation / symbol
63	3F	00111111	?	Punctuation / symbol
64	40	01000000	@	Punctuation / symbol
65	41	01000001	A	Uppercase letter
66	42	01000010	B	Uppercase letter
67	43	01000011	C	Uppercase letter
68	44	01000100	D	Uppercase letter
69	45	01000101	E	Uppercase letter
70	46	01000110	F	Uppercase letter
71	47	01000111	G	Uppercase letter
72	48	01001000	H	Uppercase letter
73	49	01001001	I	Uppercase letter
74	4A	01001010	J	Uppercase letter
75	4B	01001011	K	Uppercase letter
76	4C	01001100	L	Uppercase letter
77	4D	01001101	M	Uppercase letter
78	4E	01001110	N	Uppercase letter
79	4F	01001111	O	Uppercase letter
80	50	01010000	P	Uppercase letter
81	51	01010001	Q	Uppercase letter
82	52	01010010	R	Uppercase letter
83	53	01010011	S	Uppercase letter
84	54	01010100	T	Uppercase letter
85	55	01010101	U	Uppercase letter
86	56	01010110	V	Uppercase letter
87	57	01010111	W	Uppercase letter
88	58	01011000	X	Uppercase letter
89	59	01011001	Y	Uppercase letter
90	5A	01011010	Z	Uppercase letter
91	5B	01011011	[	Punctuation / symbol
92	5C	01011100	\	Punctuation / symbol
93	5D	01011101	]	Punctuation / symbol
94	5E	01011110	^	Punctuation / symbol
95	5F	01011111	_	Punctuation / symbol
96	60	01100000	`	Punctuation / symbol
97	61	01100001	a	Lowercase letter
98	62	01100010	b	Lowercase letter
99	63	01100011	c	Lowercase letter
100	64	01100100	d	Lowercase letter
101	65	01100101	e	Lowercase letter
102	66	01100110	f	Lowercase letter
103	67	01100111	g	Lowercase letter
104	68	01101000	h	Lowercase letter
105	69	01101001	i	Lowercase letter
106	6A	01101010	j	Lowercase letter
107	6B	01101011	k	Lowercase letter
108	6C	01101100	l	Lowercase letter
109	6D	01101101	m	Lowercase letter
110	6E	01101110	n	Lowercase letter
111	6F	01101111	o	Lowercase letter
112	70	01110000	p	Lowercase letter
113	71	01110001	q	Lowercase letter
114	72	01110010	r	Lowercase letter
115	73	01110011	s	Lowercase letter
116	74	01110100	t	Lowercase letter
117	75	01110101	u	Lowercase letter
118	76	01110110	v	Lowercase letter
119	77	01110111	w	Lowercase letter
120	78	01111000	x	Lowercase letter
121	79	01111001	y	Lowercase letter
122	7A	01111010	z	Lowercase letter
123	7B	01111011	{	Punctuation / symbol
124	7C	01111100	\|	Punctuation / symbol
125	7D	01111101	}	Punctuation / symbol
126	7E	01111110	~	Punctuation / symbol
127	7F	01111111	DEL	Delete (control character)

Reading the table

A few landmarks worth memorizing: digits 0–9 are decimal 48–57, uppercase A–Z are 65–90, and lowercase a–z are 97–122. Notice that uppercase and lowercase letters are exactly 32 apart — flipping that single bit converts between cases, which is why case conversion is so cheap for computers.

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