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0~31及127(共33个)是控制字符或通信专用字符(其余为可显示字符),如控制符:LF(换行)、CR(回车)、FF(换页)、DEL(删除)、BS(退格)、BEL(振铃)等;通信专用字符:SOH(文头)、EOT(文尾)、ACK(确认)等;ASCII值为 8、9、10 和 13 分别转换为退格、制表、换行和回车字符。它们并没有特定的图形显示,但会依不同的应用程序,而对文本显示有不同的影响。
32~126(共95个)是字符(32sp是空格),其中48~57为0到9十个阿拉伯数字;
65~90为26个大写英文字母,97~122号为26个小写英文字母,其余为一些标点符号、运算符号等。
常见ASCII码的大小规则
0~91)数字比字母要小。如 “7”<“F”;
2)数字0比数字9要小,并按0到9顺序递增。如 “3”<“8” ;
3)字母A比字母Z要小,并按A到Z顺序递增。如“A”<“Z” ;
4)同个字母的大写字母比小写字母要小32。如“A”<“a” 。
记住几个常见字母的ASCII码大小:
换行LF为0x0A;回车CR为0x0D;空格为0x20;“0”为0x30; “A”为0x41;“a”为0x61。
标准ASCII表
Bin |
Dec |
Hex |
缩写/字符 |
解释 |
00000000 |
0 |
00 |
NUL(null) |
空字符 |
00000001 |
1 |
01 |
SOH(start of headling) |
标题开始 |
00000010 |
2 |
02 |
STX (start of text) |
正文开始 |
00000011 |
3 |
03 |
ETX (end of text) |
正文结束 |
00000100 |
4 |
04 |
EOT (end of transmission) |
传输结束 |
00000101 |
5 |
05 |
ENQ (enquiry) |
请求 |
00000110 |
6 |
06 |
ACK (acknowledge) |
收到通知 |
00000111 |
7 |
07 |
BEL (bell) |
响铃 |
00001000 |
8 |
08 |
BS (backspace) |
退格 |
00001001 |
9 |
09 |
HT (horizontal tab) |
水平制表符 |
00001010 |
10 |
0A |
LF (NL line feed, new line) |
换行键 |
00001011 |
11 |
0B |
VT (vertical tab) |
垂直制表符 |
00001100 |
12 |
0C |
FF (NP form feed, new page) |
换页键 |
00001101 |
13 |
0D |
CR (carriage return) |
回车键 |
00001110 |
14 |
0E |
SO (shift out) |
不用切换 |
00001111 |
15 |
0F |
SI (shift in) |
启用切换 |
00010000 |
16 |
10 |
DLE (data link escape) |
数据链路转义 |
00010001 |
17 |
11 |
DC1 (device control 1) |
设备控制1 |
00010010 |
18 |
12 |
DC2 (device control 2) |
设备控制2 |
00010011 |
19 |
13 |
DC3 (device control 3) |
设备控制3 |
00010100 |
20 |
14 |
DC4 (device control 4) |
设备控制4 |
00010101 |
21 |
15 |
NAK (negative acknowledge) |
拒绝接收 |
00010110 |
22 |
16 |
SYN (synchronous idle) |
同步空闲 |
00010111 |
23 |
17 |
ETB (end of trans. block) |
传输块结束 |
00011000 |
24 |
18 |
CAN (cancel) |
取消 |
00011001 |
25 |
19 |
EM (end of medium) |
介质中断 |
00011010 |
26 |
1A |
SUB (substitute) |
替补 |
00011011 |
27 |
1B |
ESC (escape) |
溢出 |
00011100 |
28 |
1C |
FS (file separator) |
文件分割符 |
00011101 |
29 |
1D |
GS (group separator) |
分组符 |
00011110 |
30 |
1E |
RS (record separator) |
记录分离符 |
00011111 |
31 |
1F |
US (unit separator) |
单元分隔符 |
00100000 |
32 |
20 |
(space) |
空格 |
00100001 |
33 |
21 |
! |
|
00100010 |
34 |
22 |
" |
|
00100011 |
35 |
23 |
# |
|
00100100 |
36 |
24 |
$ |
|
00100101 |
37 |
25 |
% |
|
00100110 |
38 |
26 |
& |
|
00100111 |
39 |
27 |
' |
|
00101000 |
40 |
28 |
( |
|
00101001 |
41 |
29 |
) |
|
00101010 |
42 |
2A |
* |
|
00101011 |
43 |
2B |
+ |
|
00101100 |
44 |
2C |
, |
|
00101101 |
45 |
2D |
- |
|
00101110 |
46 |
2E |
. |
|
00101111 |
47 |
2F |
/ |
|
00110000 |
48 |
30 |
0 |
|
续表
00110001 |
49 |
31 |
1 |
|
00110010 |
50 |
32 |
2 |
|
00110011 |
51 |
33 |
3 |
|
00110100 |
52 |
34 |
4 |
|
00110101 |
53 |
35 |
5 |
|
00110110 |
54 |
36 |
6 |
|
00110111 |
55 |
37 |
7 |
|
00111000 |
56 |
38 |
8 |
|
00111001 |
57 |
39 |
9 |
|
00111010 |
58 |
3A |
: |
|
00111011 |
59 |
3B |
; |
|
00111100 |
60 |
3C |
< |
|
00111101 |
61 |
3D |
= |
|
00111110 |
62 |
3E |
> |
|
00111111 |
63 |
3F |
? |
|
01000000 |
64 |
40 |
@ |
|
01000001 |
65 |
41 |
A |
|
01000010 |
66 |
42 |
B |
|
01000011 |
67 |
43 |
C |
|
01000100 |
68 |
44 |
D |
|
01000101 |
69 |
45 |
E |
|
01000110 |
70 |
46 |
F |
|
01000111 |
71 |
47 |
G |
|
01001000 |
72 |
48 |
H |
|
01001001 |
73 |
49 |
I |
|
01001010 |
74 |
4A |
J |
|
01001011 |
75 |
4B |
K |
|
01001100 |
76 |
4C |
L |
|
01001101 |
77 |
4D |
M |
|
01001110 |
78 |
4E |
N |
|
01001111 |
79 |
4F |
O |
|
01010000 |
80 |
50 |
P |
|
01010001 |
81 |
51 |
Q |
|
01010010 |
82 |
52 |
R |
|
01010011 |
83 |
53 |
S |
|
01010100 |
84 |
54 |
T |
|
01010101 |
85 |
55 |
U |
|
01010110 |
86 |
56 |
V |
|
01010111 |
87 |
57 |
W |
|
01011000 |
88 |
58 |
X |
|
01011001 |
89 |
59 |
Y |
|
01011010 |
90 |
5A |
Z |
|
01011011 |
91 |
5B |
[ |
|
01011100 |
92 |
5C |
\ |
|
01011101 |
93 |
5D |
] |
|
01011110 |
94 |
5E |
^ |
|
01011111 |
95 |
5F |
_ |
|
01100000 |
96 |
60 |
` |
|
01100001 |
97 |
61 |
a |
|
01100010 |
98 |
62 |
b |
|
续表
01100011 |
99 |
63 |
c |
|
01100100 |
100 |
64 |
d |
|
01100101 |
101 |
65 |
e |
|
01100110 |
102 |
66 |
f |
|
01100111 |
103 |
67 |
g |
|
01101000 |
104 |
68 |
h |
|
01101001 |
105 |
69 |
i |
|
01101010 |
106 |
6A |
j |
|
01101011 |
107 |
6B |
k |
|
01101100 |
108 |
6C |
l |
|
01101101 |
109 |
6D |
m |
|
01101110 |
110 |
6E |
n |
|
01101111 |
111 |
6F |
o |
|
01110000 |
112 |
70 |
p |
|
01110001 |
113 |
71 |
q |
|
01110010 |
114 |
72 |
r |
|
01110011 |
115 |
73 |
s |
|
01110100 |
116 |
74 |
t |
|
01110101 |
117 |
75 |
u |
|
01110110 |
118 |
76 |
v |
|
01110111 |
119 |
77 |
w |
|
01111000 |
120 |
78 |
x |
|
01111001 |
121 |
79 |
y |
|
01111010 |
122 |
7A |
z |
|
01111011 |
123 |
7B |
{ |
|
01111100 |
124 |
7C |
| |
|
01111101 |
125 |
7D |
} |
|
01111110 |
126 |
7E |
~ |
|
01111111 |
127 |
7F |
DEL (delete) |
删除 |
八进制 |
十六进制 |
十进制 |
字符 |
八进制 |
十六进制 |
十进制 |
字符 |
0 |
0 |
0 |
nul |
100 |
40 |
64 |
@ |
1 |
1 |
1 |
soh |
101 |
41 |
65 |
A |
2 |
2 |
2 |
stx |
102 |
42 |
66 |
B |
3 |
3 |
3 |
etx |
103 |
43 |
67 |
C |
4 |
4 |
4 |
eot |
104 |
44 |
68 |
D |
5 |
5 |
5 |
enq |
105 |
45 |
69 |
E |
6 |
6 |
6 |
ack |
106 |
46 |
70 |
F |
7 |
7 |
7 |
bel |
107 |
47 |
71 |
G |
10 |
8 |
8 |
bs |
110 |
48 |
72 |
H |
11 |
9 |
9 |
ht |
111 |
49 |
73 |
I |
12 |
0a |
10 |
nl |
112 |
4a |
74 |
J |
13 |
0b |
11 |
vt |
113 |
4b |
75 |
K |
14 |
0c |
12 |
ff |
114 |
4c |
76 |
L |
15 |
0d |
13 |
er |
115 |
4d |
77 |
M |
16 |
0e |
14 |
so |
116 |
4e |
78 |
N |
17 |
0f |
15 |
si |
117 |
4f |
79 |
O |
20 |
10 |
16 |
dle |
120 |
50 |
80 |
P |
21 |
11 |
17 |
dc1 |
121 |
51 |
81 |
Q |
22 |
12 |
18 |
dc2 |
122 |
52 |
82 |
R |
23 |
13 |
19 |
dc3 |
123 |
53 |
83 |
S |
24 |
14 |
20 |
dc4 |
124 |
54 |
84 |
T |
25 |
15 |
21 |
nak |
125 |
55 |
85 |
U |
26 |
16 |
22 |
syn |
126 |
56 |
86 |
V |
27 |
17 |
23 |
etb |
127 |
57 |
87 |
W |
30 |
18 |
24 |
can |
130 |
58 |
88 |
X |
31 |
19 |
25 |
em |
131 |
59 |
89 |
Y |
32 |
1a |
26 |
sub |
132 |
5a |
90 |
Z |
33 |
1b |
27 |
esc |
133 |
5b |
91 |
[ |
34 |
1c |
28 |
fs |
134 |
5c |
92 |
\ |
35 |
1d |
29 |
gs |
135 |
5d |
93 |
] |
36 |
1e |
30 |
re |
136 |
5e |
94 |
^ |
37 |
1f |
31 |
us |
137 |
5f |
95 |
_ |
40 |
20 |
32 |
sp |
140 |
60 |
96 |
' |
41 |
21 |
33 |
! |
141 |
61 |
97 |
a |
42 |
22 |
34 |
" |
142 |
62 |
98 |
b |
43 |
23 |
35 |
# |
143 |
63 |
99 |
c |
44 |
24 |
36 |
$ |
144 |
64 |
100 |
d |
45 |
25 |
37 |
% |
145 |
65 |
101 |
e |
46 |
26 |
38 |
& |
146 |
66 |
102 |
f |
47 |
27 |
39 |
` |
147 |
67 |
103 |
g |
50 |
28 |
40 |
( |
150 |
68 |
104 |
h |
51 |
29 |
41 |
) |
151 |
69 |
105 |
i |
52 |
2a |
42 |
* |
152 |
6a |
106 |
j |
53 |
2b |
43 |
+ |
153 |
6b |
107 |
k |
54 |
2c |
44 |
, |
154 |
6c |
108 |
l |
55 |
2d |
45 |
- |
155 |
6d |
109 |
m |
56 |
2e |
46 |
. |
156 |
6e |
110 |
n |
57 |
2f |
47 |
/ |
157 |
6f |
111 |
o |
60 |
30 |
48 |
0 |
160 |
70 |
112 |
p |
61 |
31 |
49 |
1 |
161 |
71 |
113 |
q |
62 |
32 |
50 |
2 |
162 |
72 |
114 |
r |
63 |
33 |
51 |
3 |
163 |
73 |
115 |
s |
64 |
34 |
52 |
4 |
164 |
74 |
116 |
t |
65 |
35 |
53 |
5 |
165 |
75 |
117 |
u |
66 |
36 |
54 |
6 |
166 |
76 |
118 |
v |
67 |
37 |
55 |
7 |
167 |
77 |
119 |
w |
70 |
38 |
56 |
8 |
170 |
78 |
120 |
x |
71 |
39 |
57 |
9 |
171 |
79 |
121 |
y |
72 |
3a |
58 |
: |
172 |
7a |
122 |
z |
73 |
3b |
59 |
; |
173 |
7b |
123 |
{ |
74 |
3c |
60 |
< |
174 |
7c |
124 |
| |
75 |
3d |
61 |
= |
175 |
7d |
125 |
} |
76 |
3e |
62 |
> |
176 |
7e |
126 |
~ |
77 |
3f |
63 |
? |
177 |
7f |
127 |
del |