Tools / ASCII Table

ASCII Table

Look up any ASCII value by typing a character, decimal number, hex code (0x41), or binary value (0b1000001). Click any row to see all representations at once. Filter by category to narrow down the table.

Quick lookup

Hex	Oct	Bin	Char	Name
00	000	00000000		NUL
01	001	00000001		SOH
02	002	00000010		STX
03	003	00000011		ETX
04	004	00000100		EOT
05	005	00000101		ENQ
06	006	00000110		ACK
07	007	00000111		BEL
08	010	00001000		BS
09	011	00001001		TAB
0A	012	00001010		LF
0B	013	00001011		VT
0C	014	00001100		FF
0D	015	00001101		CR
0E	016	00001110		SO
0F	017	00001111		SI
10	020	00010000		DLE
11	021	00010001		DC1
12	022	00010010		DC2
13	023	00010011		DC3
14	024	00010100		DC4
15	025	00010101		NAK
16	026	00010110		SYN
17	027	00010111		ETB
18	030	00011000		CAN
19	031	00011001		EM
1A	032	00011010		SUB
1B	033	00011011		ESC
1C	034	00011100		FS
1D	035	00011101		GS
1E	036	00011110		RS
1F	037	00011111		US
20	040	00100000		Space
21	041	00100001	!	!
22	042	00100010	"	"
23	043	00100011	#	#
24	044	00100100	$	$
25	045	00100101	%	%
26	046	00100110	&	&
27	047	00100111	'	'
28	050	00101000	(	(
29	051	00101001	)	)
2A	052	00101010	*	*
2B	053	00101011	+	+
2C	054	00101100	,	,
2D	055	00101101	-	-
2E	056	00101110	.	.
2F	057	00101111	/	/
30	060	00110000	0	0
31	061	00110001	1	1
32	062	00110010	2	2
33	063	00110011	3	3
34	064	00110100	4	4
35	065	00110101	5	5
36	066	00110110	6	6
37	067	00110111	7	7
38	070	00111000	8	8
39	071	00111001	9	9
3A	072	00111010	:	:
3B	073	00111011	;	;
3C	074	00111100	<	<
3D	075	00111101	=	=
3E	076	00111110	>	>
3F	077	00111111	?	?
40	100	01000000	@	@
41	101	01000001	A	A
42	102	01000010	B	B
43	103	01000011	C	C
44	104	01000100	D	D
45	105	01000101	E	E
46	106	01000110	F	F
47	107	01000111	G	G
48	110	01001000	H	H
49	111	01001001	I	I
4A	112	01001010	J	J
4B	113	01001011	K	K
4C	114	01001100	L	L
4D	115	01001101	M	M
4E	116	01001110	N	N
4F	117	01001111	O	O
50	120	01010000	P	P
51	121	01010001	Q	Q
52	122	01010010	R	R
53	123	01010011	S	S
54	124	01010100	T	T
55	125	01010101	U	U
56	126	01010110	V	V
57	127	01010111	W	W
58	130	01011000	X	X
59	131	01011001	Y	Y
5A	132	01011010	Z	Z
5B	133	01011011	[	[
5C	134	01011100	\	\
5D	135	01011101	]	]
5E	136	01011110	^	^
5F	137	01011111	_	_
60	140	01100000	`	`
61	141	01100001	a	a
62	142	01100010	b	b
63	143	01100011	c	c
64	144	01100100	d	d
65	145	01100101	e	e
66	146	01100110	f	f
67	147	01100111	g	g
68	150	01101000	h	h
69	151	01101001	i	i
6A	152	01101010	j	j
6B	153	01101011	k	k
6C	154	01101100	l	l
6D	155	01101101	m	m
6E	156	01101110	n	n
6F	157	01101111	o	o
70	160	01110000	p	p
71	161	01110001	q	q
72	162	01110010	r	r
73	163	01110011	s	s
74	164	01110100	t	t
75	165	01110101	u	u
76	166	01110110	v	v
77	167	01110111	w	w
78	170	01111000	x	x
79	171	01111001	y	y
7A	172	01111010	z	z
7B	173	01111011	{	{
7C	174	01111100	\|	\|
7D	175	01111101	}	}
7E	176	01111110	~	~
7F	177	01111111		DEL

How it works

ASCII (American Standard Code for Information Interchange) maps 128 characters to the integers 0 through 127. The first 32 codes (0-31) plus 127 are control characters like NUL, TAB, LF (line feed), and CR (carriage return). Codes 32-126 are printable: digits, uppercase and lowercase letters, punctuation, and space.

In CTF challenges, you will constantly convert between decimal, hex, and characters. A common pattern is a challenge that gives you a list of decimal or hex values that decode to the flag. For example, the sequence 112 105 99 111 67 84 70 decodes to picoCTF. This tool lets you look up each value instantly.

Key ranges to memorize: uppercase letters are 65-90 (0x41-0x5A), lowercase are 97-122 (0x61-0x7A), digits are 48-57 (0x30-0x39). The difference between uppercase and lowercase is always 32 (0x20), which is a single bit flip. This shows up in XOR-based challenges and case-manipulation puzzles.

Use this alongside the Number Base Converter for multi-base arithmetic, the XOR Cipher for byte-level XOR operations, or the Endianness Converter when reading multi-byte values from memory dumps.

ASCII Table

How it works

Challenges where it helps

Guides that use this tool

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