ASCII Table

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The Protocol Header diagrams and tables are a great reference for analyzing the structure of network packets. However, when analyzing the content of those packets, the following table can be very helpful. It contains ASCII characters, their decimal, octal, and hexadecimal equivalents, the escape sequences or CTRL key sequences used to generate the characters (where applicable), and short descriptions of each.

Decimal (Int)	Octal	Hex	ASCII (Char)	Escape Sequence/ Control Character	Description (Common Use)
0	000	00	NUL	\0, ^@	NULL character
1	001	01	SOH	CTRL-A, ^A	Start of heading
2	002	02	STX	CTRL-B, ^B	Start of text
3	003	03	ETX	CTRL-C, ^C	End of text (Abort)
4	004	04	EOT	CTRL-D, ^D	End of transmission (EOF, Logout)
5	005	05	ENQ	CTRL-E, ^E	Enquiry
6	006	06	ACK	CTRL-F, ^F	Acknowledge
7	007	07	BEL	\a, CTRL-G, ^G	Bell
8	010	08	BS	\b, CTRL-H, ^H	Backspace
9	011	09	TAB	\t, CTRL-I, ^I	Horizontal tab
10	012	0A	LF	\n, CTRL-J, ^J	Newline/line feed
11	013	0B	VT	CTRL-K, ^K	Vertical tab
12	014	0C	FF	\f, CTRL-L, ^L	New page/form feed
13	015	0D	CR	\r, CTRL-M, ^M	Carriage return
14	016	0E	SO	CTRL-N, ^N	Shift out
15	017	0F	SI	CTRL-O, ^O	Shift in
16	020	10	DLE	CTRL-P, ^P	Data link escape
17	021	11	DC1	CTRL-Q, ^Q	Device control 1
18	022	12	DC2	CTRL-R, ^R	Device control 2
19	023	13	DC3	CTRL-S, ^S	Device control 3
20	024	14	DC4	CTRL-T, ^T	Device control 4
21	025	15	NAK	CTRL-U, ^U	Negative acknowledge
22	026	16	SYN	CTRL-V, ^V	Synchronous idle
23	027	17	ETB	CTRL-W, ^W	End of transmission block
24	030	18	CAN	CTRL-X, ^X	Cancel
25	031	19	EOM	CTRL-Y, ^Y	End of medium
26	032	1A	SUB	CTRL-Z, ^Z	Substitute (Suspend)
27	033	1B	ESC	\e, CTRL-[, ^[	Escape
28	034	1C	FS	CTRL-\, ^\	File separator
29	035	1D	GS	CTRL-], ^]	Group separator
30	036	1E	RS	CTRL-^, ^^	Record separator
31	037	1F	US	CTRL-_, ^_	Unit separator
32	040	20	SPACE		Space (Spacebar)
33	041	21	!		Exclamation point
34	042	22	“		Double quote
35	043	23	#		Pound sign
36	044	24	$		Dollar sign
37	045	25	%		Percent
38	046	26	&		Ampersand
39	047	27	‘		Single quote/ Apostrophe
40	050	28	(		Start parentheses
41	051	29	)		Close parentheses
42	052	2A	*		Asterisk/Multiply
43	053	2B	+		Plus
44	054	2C	,		Comma
45	055	2D	-		Hyphen/Dash/ Minus
46	056	2E	.		Period
47	057	2F	/		Forward slash/ Division
48	060	30	0		Zero
49	061	31	1		One
50	062	32	2		Two
51	063	33	3		Three
52	064	34	4		Four
53	065	35	5		Five
54	066	36	6		Six
55	067	37	7		Seven
56	070	38	8		Eight
57	071	39	9		Nine
58	072	3A	:		Colon
59	073	3B	;		Semicolon
60	074	3C	<		Less-than sign
61	075	3D	=		Equal sign
62	076	3E	>		Greater-than sign
63	077	3F	?		Question mark
64	080	40	@		At sign
65	081	41	A		Uppercase A
66	082	42	B		Uppercase B
67	083	43	C		Uppercase C
68	084	44	D		Uppercase D
69	085	45	E		Uppercase E
70	086	46	F		Uppercase F
71	087	47	G		Uppercase G
72	090	48	H		Uppercase H
73	091	49	I		Uppercase I
74	092	4A	J		Uppercase J
75	093	4B	K		Uppercase K
76	094	4C	L		Uppercase L
77	095	4D	M		Uppercase M
78	096	4E	N		Uppercase N
79	097	4F	O		Uppercase O
80	100	50	P		Uppercase P
81	101	51	Q		Uppercase Q
82	102	52	R		Uppercase R
83	103	53	S		Uppercase S
84	104	54	T		Uppercase T
85	105	55	U		Uppercase U
86	106	56	V		Uppercase V
87	107	57	W		Uppercase W
88	110	58	X		Uppercase X
89	111	59	Y		Uppercase Y
90	112	5A	Z		Uppercase Z
91	113	5B	[		Start bracket
92	114	5C	\		Backslash
93	115	5D	]		Close bracket
94	116	5E	^		Caret
95	117	5F	_		Underscore
96	120	60	`		Back quote
97	121	61	a		Lowercase a
98	122	62	b		Lowercase b
99	123	63	c		Lowercase c
100	124	64	d		Lowercase d
101	125	65	e		Lowercase e
102	126	66	f		Lowercase f
103	127	67	g		Lowercase g
104	130	68	h		Lowercase h
105	131	69	i		Lowercase i
106	132	6A	j		Lowercase j
107	133	6B	k		Lowercase k
108	134	6C	l		Lowercase l
109	135	6D	m		Lowercase m
110	136	6E	n		Lowercase n
111	137	6F	o		Lowercase o
112	140	70	p		Lowercase p
113	141	71	q		Lowercase q
114	142	72	r		Lowercase r
115	143	73	s		Lowercase s
116	144	74	t		Lowercase t
117	145	75	u		Lowercase u
118	146	76	v		Lowercase v
119	147	77	w		Lowercase w
120	150	78	x		Lowercase x
121	151	79	y		Lowercase y
122	152	7A	z		Lowercase z
123	153	7B	{		Start curly bracket
124	154	7C	|		Pipe
125	155	7D	}		Close curly bracket
126	156	7E	~		Tilde
127	157	7F	DEL		Delete

*Escape sequences for any character can be written using a backslash followed by the octal or hex  code. For example, character 9 (Horizontal tab) can be written \t, \011, or \x09.

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