Common ASCII code Details table (0-255)

0th ~ 32 and 127th (34 in total) are control characters or communication special characters, such
Control letter: LF (line feed), Cr (Press ENTER), FF (page feed), del (delete), BEL (zhenling), etc;
Communication special characters: Soh, EOT, ack, etc;

33rd ~ 126 (94 in total) is a character, of which 48th ~ Number 57 is 0 ~ 9. 10 Arabic numerals;

65 ~ The 90 is 26 uppercase English letters, 97 ~ There are 26 lower-case English letters, and the remaining are some punctuation marks and operator numbers.

The last 128 (128-255) are called extended ASCII codes. Currently, many x86-based systems support extended (or "high") ASCII codes. See the extension table at the end:

Binary	HEX	Dec	Abbreviations/characters	Explanation
00000000	00	0	Nul (null)	NULL Character
00000001	01	1	Soh (startof handling)	Title start
00000010	02	2	STX (start of text)	Start of Text
00000011	03	3	Etx (end of text)	Text ended
00000100	04	4	EOT (end of transm-ission)	Transfer completed
00000101	05	5	Enq (Enquiry)	Request
00000110	06	6	Ack (acknow-ledge)	Receive notification
00000111	07	7	BEL (Bell)	Ring tones
00001000	08	8	BS (backsp-Ace)	Return
00001001	09	9	HT (horizon-tal tab)	Horizontal Tab
00001010	0a	10	LF (NL line feed, new line)	Line feed key
00001011	0b	11	Vt (vertical tab)	Vertical Tab
00001100	0c	12	Ff (NP form feed, new page)	Page feed key
00001101	0d	13	Cr (carriage return)	Enter key
00001110	0e	14	So (shift out)	No switchover
00001111	0f	15	Si (shift in)	Enable Switch
00010000	10	16	Dle (Data Link escape)	Data Link escape
00010001	11	17	DC1 (Device Control 1)	Device Control 1
00010010	12	18	DC2 (Device Control 2)	Device Control 2
00010011	13	19	DC3 (Device Control 3)	Device Control 3
00010100	14	20	Dc4 (Device Control 4)	Device Control 4
00010101	15	21	Nak (negative acknowledge	Reject
00010110	16	22	Syn (synchr-onous idle)	Synchronization idle
00010111	17	23	Etb (end of Trans. Block)	Transfer Block ended
00011000	18	24	Can (cancel)	Cancel
00011001	19	25	EM (end of medium)	Media interruption
00011010	1a	26	Sub (substit-ute)	Substitutes
00011011	1B	27	ESC (escape)	Overflow
00011100	1c	28	FS (File separat-or)	File delimiter
00011101	1D	29	GS (group separat-or)	Group Operator
00011110	1e	30	RS (record separat-or)	Record delimiter
00011111	1f	31	US (Unit separat-or)	Unit Separator
00100000	20	32		Space
00100001	21	33	!
00100010	22	34	"
00100011	23	35	#
00100100	24	36	$
00100101	25	37	%
00100110	26	38	&
00100111	27	39	'
00101000	28	40	(
00101001	29	41	)
00101010	2a	42	*
00101011	2b	43	+
00101100	2c	44	,
00101101	2d	45	-
00101110	2e	46	.
00101111	2f	47	/
00110000	30	48	0
00110001	31	49	1
00110010	32	50	2
00110011	33	51	3
00110100	34	52	4
00110101	35	53	5
00110110	36	54	6
00110111	37	55	7
00111000	38	56	8
00111001	39	57	9
00111010	3A	58	:
00111011	3b	59	;
00111100	3c	60	<
00111101	3D	61	=
00111110	3E	62	>
00111111	3f	63	?
01000000	40	64	@
01000001	41	65	A
01000010	42	66	B
01000011	43	67	C
01000100	44	68	D
01000101	45	69	E
01000110	46	70	F
01000111	47	71	G
01001000	48	72	H
01001001	49	73	I
01001010	4A	74	J
01001011	4b	75	K
01001100	4C	76	L
01001101	4d	77	M
01001110	4e	78	N
01001111	4f	79	O
01010000	50	80	P
01010001	51	81	Q
01010010	52	82	R
01010011	53	83	S
01010100	54	84	T
01010101	55	85	U
01010110	56	86	V
01010111	57	87	W
01011000	58	88	X
01011001	59	89	Y
01011010	5A	90	Z
01011011	5b	91	[
01011100	5C	92	\
01011101	5D	93	]
01011110	5E	94	^
01011111	5f	95	_
01100000	60	96	'
01100001	61	97	A
01100010	62	98	B
01100011	63	99	C
01100100	64	100	D
01100101	65	101	E
01100110	66	102	F
01100111	67	103	G
01101000	68	104	H
01101001	69	105	I
01101010	6a	106	J
01101011	6b	107	K
01101100	6c	108	L
01101101	6d	109	M
01101110	6e	110	N
01101111	6f	111	O
01110000	70	112	P
01110001	71	113	Q
01110010	72	114	R
01110011	73	115	S
01110100	74	116	T
01110101	75	117	U
01110110	76	118	V
01110111	77	119	W
01111000	78	120	X
01111001	79	121	Y
01111010	7A	122	Z
01111011	7b	123	{
01111100	7c	124	|
01111101	7D	125	}
01111110	7E	126	~
01111111	7f	127	Del (delete)	Delete

Extended table: