ASCII Table: Complete ASCII Code Reference (0-127)

Comprehensive ASCII reference table showing decimal, hex, octal, and binary values for all 128 ASCII characters. Includes control characters (NUL, SOH, STX), printable characters, and extended ASCII. Search and filter by character or code.

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ASCII Character Table (0-127)

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

Legend

Dec

Decimal (base-10)

Hex

Hexadecimal (base-16)

Oct

Octal (base-8)

Binary

Binary (base-2)

How it works

This tool displays the complete ASCII character table, showing all 128 standard ASCII codes (0-127) with their decimal, hexadecimal, octal, binary, and character representations.

The table organizes characters by code value, making it easy to look up any ASCII character's various representations. Control characters (0-31) show their abbreviations, while printable characters (32-126) display directly.

ASCII table sections:

0-31Control characters (NUL, SOH, etc.)

32-126Printable characters (space to ~)

127Delete character (DEL)

Search by character, code, or description. Click any row to copy the character or code value. Use the filter to show only printable characters or include control codes.

When you'd actually use this

Looking up ASCII codes for programming

A developer needs the ASCII code for newline in their code. They check the table and find LF (Line Feed) is code 10, or 0x0A in hex, for use in their byte array.

Understanding control characters

A student learning about text files encounters \r\n line endings. They look up CR (13) and LF (10) to understand what these control characters actually do.

Debugging character encoding issues

A QA engineer sees unexpected behavior with tab characters. They verify that tab is ASCII 9 (0x09) and check if their code handles it correctly.

Writing character classification functions

A programmer writes isDigit() and isAlpha() functions. They reference the ASCII table to find that digits are 48-57, uppercase is 65-90, lowercase is 97-122.

Creating test data with special characters

A tester needs input with specific control characters. They use the table to find the codes and generate test strings with null bytes, tabs, or other special characters.

Learning computer science fundamentals

A beginner studies how computers represent text. The ASCII table shows the mapping between characters and numbers, a fundamental concept in computing.

What to know before using it

ASCII only has 128 characters.Standard ASCII covers codes 0-127. Extended ASCII (128-255) varies by code page and isn't standardized. Unicode extends this to over 140,000 characters.

Control characters aren't printable.Codes 0-31 and 127 are control characters. They affect text formatting (like tab, newline) or have historical meanings (like bell, escape) but don't display as visible symbols.

Case matters in ASCII.Uppercase and lowercase letters have different codes. 'A' is 65, 'a' is 97. The 32-point difference is consistent—flip bit 5 to toggle case.

Some control characters are still used.NUL (0), TAB (9), LF (10), CR (13), and ESC (27) are still common in modern systems. Others like SOH, STX, ETX are mostly historical.

Pro tip: Memorize key ranges: 48-57 for digits, 65-90 for uppercase, 97-122 for lowercase. These patterns help you quickly validate character types in code without looking them up.

Common questions

What is ASCII code for space?

Space is ASCII 32 (0x20 in hex, 040 in octal). It's the first printable character. Codes below 32 are control characters.

What's the difference between CR and LF?

CR (Carriage Return, 13) moves the cursor to the start of the line. LF (Line Feed, 10) moves down one line. Windows uses both (CRLF) for line endings. Unix uses just LF.

Why are digits 48-57 not 0-9?

ASCII reserves codes 0-31 for control characters. Printable characters start at 32 (space). Digits begin at 48 so '0' is 48, '1' is 49, etc. This leaves room for punctuation first.

What character is ASCII 0?

ASCII 0 is NUL, the null character. It's used to terminate strings in C and C++. You can't display it—it has no visual representation.

Is ASCII still used today?

Yes, ASCII is the foundation of Unicode. The first 128 Unicode code points match ASCII exactly. Most English text is still pure ASCII even in UTF-8 encoding.

What's the ASCII code for newline?

It depends on the system. Unix/Linux/macOS use LF (10). Windows uses CR+LF (13, 10). Old Mac (pre-OS X) used just CR (13).

How do I type control characters?

Use keyboard shortcuts: Ctrl+@ for NUL, Ctrl+I for TAB, Ctrl+M for CR, Ctrl+[ for ESC. Or use escape sequences in code: \0, \t, \n, \r, \e.

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