Appendix 3: 7-Bit ASCII Code Table¶

In addition to listing the ASCII character codes in their usual form, this table also expresses the hexadecimal codes for the ASCII digits 0–9 and the upper-case letters A–Z in shifted form; i.e. shifted one bit left. This is particularly useful for decoding callsigns and Mic-E position information contained in the address fields of AX.25 frames.

Part 1: Codes 0–31 decimal (00–1f hexadecimal)¶

*Dec*	*Hex*	*Char*
0	00	NUL	CTRL-@
1	01	SOH	CTRL-A	Start of Header
2	02	STX	CTRL-B	Start of Text
3	03	ETX	CTRL-C	End of Text
4	04	EOT	CTRL-D	End of Transmission
5	05	ENQ	CTRL-E	Enquiry (Poll)
6	06	ACK	CTRL-F	Acknowledge
7	07	BEL	CTRL-G	Bell
8	08	BS	CTRL-H	Backspace
9	09	HT	CTRL-I	Horizontal Tab
10	0a	LF	CTRL-J	Line Feed
11	0b	VT	CTRL-K	Vertical Tab
12	0c	FF	CTRL-L	Form Feed
13	0d	CR	CTRL-M	Carriage Return
14	0e	SO	CTRL-N	Shift Out
15	0f	SI	CTRL-O	Shift In
16	10	DLE	CRTL-P	Data Link Escape
17	11	DC1/XON	CTRL-Q	Device Control 1
18	12	DC2	CTRL-R	Device Control 2
19	13	DC3/XOFF	CTRL-S	Device Control 3
20	14	DC4	CTRL-T	Device Control 4
21	15	NAK	CTRL-U	Negative Acknowledge
22	16	SYN	CTRL-V	Synchronous Idle
23	17	ETB	CTRL-W	End of Transmission Block
24	18	CAN	CTRL-X	Cancel
25	19	EM	CTRL-Y	End of Medium
26	1a	SUB	CTRL-Z	Substitute
27	1b	ESC	CTRL-[	Escape
28	1c	FS	CTRL-\	File Separator
29	1d	GS	CTRL-]	Group Separator
30	1e	RS	CTRL-^	Record Separator
31	1f	US	CTRL-_	Unit Separator

Part 2: Codes 32–127 decimal (20–7f hexadecimal), including hex codes for shifted 0–9/A–Z

*Dec*	*Hex*	*Char*	*Shifted*
32	20	˽	40/41 (space)
33	21	!
34	22	"	(inv commas)
35	23	#
36	24	$
37	25	%
38	26	&
39	27	'	(apostrophe)
40	28	(
41	29	)
42	2a	*
43	2b	+
44	2c	,	(comma)
45	2d	-	(minus)
46	2e	.	(dot)
47	2f	/
48	30	0	60/61
49	31	1	62/63
50	32	2	64/65
51	33	3	66/67
52	34	4	68/69
53	35	5	6a/6b
54	36	6	6c/6d
55	37	7	6e/6f
56	38	8	70/71
57	39	9	72/73
58	3a	:
59	3b	;
60	3c	<
61	3d	=
62	3e	>
63	3f	?
64	40	@
65	41	A	82/83
66	42	B	84/85
67	43	C	86/87
68	44	D	88/89
69	45	E	8a/8b
70	46	F	8c/8d
71	47	G	8e/8f
72	48	H	90/91
73	49	I	92/93
74	4a	J	94/95
75	4b	K	96/97
76	4c	L	98/99
77	4d	M	9a/9b
78	4e	N	9c/9d
79	4f	O	9e/9f

*Dec*	*Hex*	*Char*	*Shifted*
80	50	P	a0/a1
81	51	Q	a2/a3
82	52	R	a4/a5
83	53	S	a6/a7
84	54	T	a8/a9
85	55	U	aa/ab
86	56	V	ac/ad
87	57	W	ae/af
88	58	X	b0/b1
89	59	Y	b2/b3
90	5a	Z	b4/b5
91	5b	[
92	5c	\
93	5d	]
94	5e	^
95	5f	_	(underscore)
96	60	‘	(grave accent)
97	61	a
98	62	b
99	63	c
100	64	d
101	65	e
102	66	f
103	67	g
104	68	h
105	69	i
106	6a	j
107	6b	k
108	6c	l
109	6d	m
110	6e	n
111	6f	o
112	70	p
113	71	q
114	72	r
115	73	s
116	74	t
117	75	u
118	76	v
119	77	w
120	78	x
121	79	y
122	7a	z
123	7b	{
124	7c
125	7d	}
126	7e	~
127	7f	DEL