ASCII Table

Dec	Hex	Char	Description	Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
0	0	NUL	(null)	32	20		64	40	@	96	60	`
1	1	SOH	(start of heading)	33	21	!	65	41	A	97	61	a
2	2	STX	(start of text)	34	22	"	66	42	B	98	62	b
3	3	ETX	(end of text)	35	23	#	67	43	C	99	63	c
4	4	EOT	(end of transmission)	36	24	$	68	44	D	100	64	d
5	5	ENQ	(enquiry)	37	25	%	69	45	E	101	65	e
6	6	ACK	(acknowledge)	38	26	&	70	46	F	102	66	f
7	7	BEL	(bell)	39	27	'	71	47	G	103	67	g
8	8	BS	(backspace)	40	28	(	72	48	H	104	68	h
9	9	TAB	(horizontal tab)	41	29	)	73	49	I	105	69	i
10	A	LF	(NL line feed, new line)	42	2A	*	74	4A	J	106	6A	j
11	B	VT	(vertical tab)	43	2B	+	75	4B	K	107	6B	k
12	C	FF	(NP form feed, new page)	44	2C	,	76	4C	L	108	6C	l
13	D	CR	(carriage return)	45	2D	-	77	4D	M	109	6D	m
14	E	SO	(shift out)	46	2E	.	78	4E	N	110	6E	n
15	F	SI	(shift in)	47	2F	/	79	4F	O	111	6F	o
16	10	DLE	(data link escape)	48	30	0	80	50	P	112	70	p
17	11	DC1	(device control 1)	49	31	1	81	51	Q	113	71	q
18	12	DC2	(device control 2)	50	32	2	82	52	R	114	72	r
19	13	DC3	(device control 3)	51	33	3	83	53	S	115	73	s
20	14	DC4	(device control 4)	52	34	4	84	54	T	116	74	t
21	15	NAK	(negative acknowledge)	53	35	5	85	55	U	117	75	u
22	16	SYN	(synchronous idle)	54	36	6	86	56	V	118	76	v
23	17	ETB	(end of trans. block)	55	37	7	87	57	W	119	77	w
24	18	CAN	(cancel)	56	38	8	88	58	X	120	78	x
25	19	EM	(end of medium)	57	39	9	89	59	Y	121	79	y
26	1A	SUB	(substitute)	58	3A	:	90	5A	Z	122	7A	z
27	1B	ESC	(escape)	59	3B	;	91	5B	[	123	7B	{
28	1C	FS	(file separator)	60	3C	<	92	5C	\	124	7C	\|
29	1D	GS	(group separator)	61	3D	=	93	5D	]	125	7D	}
30	1E	RS	(record separator)	62	3E	>	94	5E	^	126	7E	~
31	1F	US	(unit separator)	63	3F	?	95	5F	_	127	7F	DEL

Format control

BS

Backspace. Indicates movement of the printing mechanism or display cursor backwards in one position.

HT

Horizontal Tabulation. Indicates movement of the printing mechanism or display cursor forward to the next preassigned 'tab' or stopping position.

LF

Line Feed. Indicates movement of the printing mechanism or display cursor to the start of the next line (ie one line down).

VT

Vertical Tabulation. Indicates movement of the printing mechanism or display cursor to the next of a series of preassigned printing lines.

FF

Form Feed. Indicates movement of the printing mechanism or display cursor to the starting position of the next page, form, or screen.

CR

Carriage Return. Indicates movement of the printing mechanism or display cursor to the starting position (left) of the current line.

Transmission control

SOH

Start of Heading. Used to indicate the start of a heading which may contain address or routing information.

STX

Start of Text. used to indicate the start of the text and so also indicates the end of the heading.

ETX

End of Text. Used to terminate the text which was started with STX. End of Transmission indicates the end of a transmission which may have included one or more 'texts' with their headings.

ENQ

Enquiry. A request for a response from a remote station. It may be used as a "who are you?" request for a station to identify itself.

ACK

Acknowledge. A character transmitted by a receiving device as an affirmation response to a sender. It is used as a positive response to polling messages.

NAK

Negative Acknowledgement. A character transmitted by a receiving device as a negative response to a sender. It is used as a negative response to polling messages.

SYN

Synchronous/Idle. Used by a synchronous transmission system to achieve synchronisation. When no data is being sent a synchronous transmission system may send SYN characters continuously.

ETB

End of Transmission Block. Indicates the end of a block of data for communication purposes. It is used for blocking data where the block structure is not necessarily related to the processing format.

Information separator

FS

File Separator.

GS

Group Separator.

RS

Record Separtator.

US

Unit Separator.

Information separators to be used in an optional manner except that their heirarchy shall be FS (the most inclusive) to US (the least inclusive).

Miscellaneous

NUL

Null. No character. Used for filling in time or filling space on tape when there is no data.

BEL

Bell. Used when there is need to call human attention. It may control alarm or attention devices.

SO

Shift Out. Indicates that the code combinations which follow shall be interpreted as _outside_ the standard character set until an SI character is reached.

SI

Shift In. Indicates that the code combinations which follow shall be interpreted according to the standard character set.

DLE

Data Link Escape. A character which shall change the meaning of one or more contiguously following characters. It can provide supplementary controls or permits the sending of data characters having any bit combination.

DC1, DC2, DC3, DC4

Device Controls. Characters for the control of ancillary devices or special terminal features.

CAN

Cancel. Indicates that the data which preceeds it in a message or block should be disregarded (usually because an error has been detected).

EM

End of Medium. Indicates the physical end of a card, tape or other medium, or the end of the required or used portion of the medium.

SUB

Substitute. Substituted for a character that is found to be erroneous or invalid.

ESC

Escape. A character intended to provide code extension in that it gives a specified number of contiguously following characters an alternate meaning.

SP

Space. A nonprinting character used to separate words, or to move the printing mechanism or display cursor forward by one position.

DEL

Delete. Used to obliterate unwanted characters (for example, on paper tape by punching a hole in _every_ bit position).

Contributor: Joakim Ögren

Source:
ASCII table at The Pin-Out directory
Data & Computer Communications from Stallings