数据库可访问IP段设置帮助这样写:
10.23.12.24/24(
CIDR模式,无类域间路由,/24表示了地址中前缀的长度,范围[1,32])
这个什么CIDR看不懂,如果要设置 10.23.*.* IP段都可访问,请问要如何设置CIDR模式?
IP/CIDR | Δ 与最后一个地址的差值 | 掩码 | 主机数 (*) | 类别 | 备注 |
a.b.c.d/32 | 0.0.0.0 | 255.255.255.255 | 1 | 1/256 C | |
a.b.c.d/31 | 0.0.0.1 | 255.255.255.254 | 2 | 1/128 C | d = 0 ... (2n) ... 254 |
a.b.c.d/30 | 0.0.0.3 | 255.255.255.252 | 4 | 1/64 C | d = 0 ... (4n) ... 252 |
a.b.c.d/29 | 0.0.0.7 | 255.255.255.248 | 8 | 1/32 C | d = 0 ... (8n) ... 248 |
a.b.c.d/28 | 0.0.0.15 | 255.255.255.240 | 16 | 1/16 C | d = 0 ... (16n) ... 240 |
a.b.c.d/27 | 0.0.0.31 | 255.255.255.224 | 32 | 1/8 C | d = 0 ... (32n) ... 224 |
a.b.c.d/26 | 0.0.0.63 | 255.255.255.192 | 64 | 1/4 C | d = 0, 64, 128, 192 |
a.b.c.d/25 | 0.0.0.127 | 255.255.255.128 | 128 | 1/2 C | d = 0, 128 |
a.b.c.0/24 | 0.0.0.255 | 255.255.255.000 | 256 | 1 C | |
a.b.c.0/23 | 0.0.1.255 | 255.255.254.000 | 512 | 2 C | c = 0 ... (2n) ... 254 |
a.b.c.0/22 | 0.0.3.255 | 255.255.252.000 | 1,024 | 4 C | c = 0 ... (4n) ... 252 |
a.b.c.0/21 | 0.0.7.255 | 255.255.248.000 | 2,048 | 8 C | c = 0 ... (8n) ... 248 |
a.b.c.0/20 | 0.0.15.255 | 255.255.240.000 | 4,096 | 16 C | c = 0 ... (16n) ... 240 |
a.b.c.0/19 | 0.0.31.255 | 255.255.224.000 | 8,192 | 32 C | c = 0 ... (32n) ... 224 |
a.b.c.0/18 | 0.0.63.255 | 255.255.192.000 | 16,384 | 64 C | c = 0, 64, 128, 192 |
a.b.c.0/17 | 0.0.127.255 | 255.255.128.000 | 32,768 | 128 C | c = 0, 128 |
a.b.0.0/16 | 0.0.255.255 | 255.255.000.000 | 65,536 | 256 C = 1 B | |
a.b.0.0/15 | 0.1.255.255 | 255.254.000.000 | 131,072 | 2 B | b = 0 ... (2n) ... 254 |
a.b.0.0/14 | 0.3.255.255 | 255.252.000.000 | 262,144 | 4 B | b = 0 ... (4n) ... 252 |
a.b.0.0/13 | 0.7.255.255 | 255.248.000.000 | 524,288 | 8 B | b = 0 ... (8n) ... 248 |
a.b.0.0/12 | 0.15.255.255 | 255.240.000.000 | 1,048,576 | 16 B | b = 0 ... (16n) ... 240 |
a.b.0.0/11 | 0.31.255.255 | 255.224.000.000 | 2,097,152 | 32 B | b = 0 ... (32n) ... 224 |
a.b.0.0/10 | 0.63.255.255 | 255.192.000.000 | 4,194,304 | 64 B | b = 0, 64, 128, 192 |
a.b.0.0/9 | 0.127.255.255 | 255.128.000.000 | 8,388,608 | 128 B | b = 0, 128 |
a.0.0.0/8 | 0.255.255.255 | 255.000.000.000 | 16,777,216 | 256 B = 1 A | |
a.0.0.0/7 | 1.255.255.255 | 254.000.000.000 | 33,554,432 | 2 A | a = 0 ... (2n) ... 254 |
a.0.0.0/6 | 3.255.255.255 | 252.000.000.000 | 67,108,864 | 4 A | a = 0 ... (4n) ... 252 |
a.0.0.0/5 | 7.255.255.255 | 248.000.000.000 | 134,217,728 | 8 A | a = 0 ... (8n) ... 248 |
a.0.0.0/4 | 15.255.255.255 | 240.000.000.000 | 268,435,456 | 16 A | a = 0 ... (16n) ... 240 |
a.0.0.0/3 | 31.255.255.255 | 224.000.000.000 | 536,870,912 | 32 A | a = 0 ... (32n) ... 224 |
a.0.0.0/2 | 63.255.255.255 | 192.000.000.000 | 1,073,741,824 | 64 A | a = 0, 64, 128, 192 |
a.0.0.0/1 | 127.255.255.255 | 128.000.000.000 | 2,147,483,648 | 128 A | a = 0, 128 |
0.0.0.0/0 | 255.255.255.255 | 000.000.000.000 | 4,294,967,296 | 256 A |
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