常见子网掩码对照表Excel下载（反、正掩码）-数通工程师的傍身笔记

##常见子网掩码对照表Excel版、Excel下载-数通工程师的傍身笔记
---
|    子网掩码     | 掩码位 |   总IP数   | 可用主机数 | C类网段数量 |
| :-------------: | :----: | :--------: | :--------: | :---------: |
| 255.255.255.255 |  /32   |     1      |     1      |   1/256th   |
| 255.255.255.254 |  /31   |     2      |     0      |   1/128th   |
| 255.255.255.252 |  /30   |     4      |     2      |   1/64th    |
| 255.255.255.248 |  /29   |     8      |     6      |   1/32nd    |
| 255.255.255.240 |  /28   |     16     |     14     |   1/16th    |
| 255.255.255.224 |  /27   |     32     |     30     |    1/8th    |
| 255.255.255.192 |  /26   |     64     |     62     |    1/4th    |
| 255.255.255.128 |  /25   |    128     |    126     |  1   half   |
|  255.255.255.0  |  /24   |    256     |    254     |      1      |
|  255.255.254.0  |  /23   |    512     |    510     |      2      |
|  255.255.252.0  |  /22   |    1024    |    1022    |      4      |
|  255.255.248.0  |  /21   |    2048    |    2046    |      8      |
|  255.255.240.0  |  /20   |    4096    |    4094    |     16      |
|  255.255.224.0  |  /19   |    8192    |    8190    |     32      |
|  255.255.192.0  |  /18   |   16384    |   16382    |     64      |
|  255.255.128.0  |  /17   |   32768    |   32766    |     128     |
|   255.255.0.0   |  /16   |   65536    |   65534    |     256     |
|   255.254.0.0   |  /15   |   131072   |   131070   |     512     |
|   255.252.0.0   |  /14   |   262144   |   262142   |    1024     |
|   255.248.0.0   |  /13   |   524288   |   524286   |    2048     |
|   255.240.0.0   |  /12   |  1048576   |  1048574   |    4096     |
|   255.224.0.0   |  /11   |  2097152   |  2097150   |    8192     |
|   255.192.0.0   |  /10   |  4194304   |  4194302   |    16384    |
|   255.128.0.0   |   /9   |  8388608   |  8388606   |    32768    |
|    255.0.0.0    |   /8   |  16777216  |  16777214  |    65536    |
|    254.0.0.0    |   /7   |  33554432  |  33554430  |   131072    |
|    252.0.0.0    |   /6   |  67108864  |  67108862  |   262144    |
|    248.0.0.0    |   /5   | 134217728  | 134217726  |   1048576   |
|    240.0.0.0    |   /4   | 268435456  | 268435454  |   2097152   |
|    224.0.0.0    |   /3   | 536870912  | 536870910  |   4194304   |
|    192.0.0.0    |   /2   | 1073741824 | 1073741822 |   8388608   |
|    128.0.0.0    |   /1   | 2147483648 | 2147483646 |  16777216   |
|     0.0.0.0     |   /0   | 4294967296 | 4294967294 |  33554432   |

---

##子网掩码反掩码对照表Excel版、Excel下载-数通工程师的傍身笔记
---

|     反掩码      | 掩码位 |     正掩码      |
| :-------------: | :----: | :-------------: |
|     0.0.0.0     |   32   | 255.255.255.255 |
|     0.0.0.1     |   31   | 255.255.255.254 |
|     0.0.0.3     |   30   | 255.255.255.252 |
|     0.0.0.7     |   29   | 255.255.255.248 |
|    0.0.0.15     |   28   | 255.255.255.240 |
|    0.0.0.31     |   27   | 255.255.255.224 |
|    0.0.0.63     |   26   | 255.255.255.192 |
|    0.0.0.127    |   25   | 255.255.255.128 |
|    0.0.0.255    |   24   |  255.255.255.0  |
|    0.0.1.255    |   23   |  255.255.254.0  |
|    0.0.3.255    |   22   |  255.255.252.0  |
|    0.0.7.255    |   21   |  255.255.248.0  |
|   0.0.15.255    |   20   |  255.255.240.0  |
|   0.0.31.255    |   19   |  255.255.224.0  |
|   0.0.63.255    |   18   |  255.255.192.0  |
|   0.0.127.255   |   17   |  255.255.128.0  |
|   0.0.255.255   |   16   |   255.255.0.0   |
|   0.1.255.255   |   15   |   255.254.0.0   |
|   0.3.255.255   |   14   |   255.252.0.0   |
|   0.7.255.255   |   13   |   255.248.0.0   |
|  0.15.255.255   |   12   |   255.240.0.0   |
|  0.31.255.255   |   11   |   255.224.0.0   |
|  0.63.255.255   |   10   |   255.192.0.0   |
|  0.127.255.255  |   9    |   255.128.0.0   |
|  0.255.255.255  |   8    |    255.0.0.0    |
|  1.255.255.255  |   7    |    254.0.0.0    |
|  3.255.255.255  |   6    |    252.0.0.0    |
|  7.255.255.255  |   5    |    248.0.0.0    |
| 15.255.255.255  |   4    |    240.0.0.0    |
| 31.255.255.255  |   3    |    224.0.0.0    |
| 63.255.255.255  |   2    |    192.0.0.0    |
| 127.255.255.255 |   1    |    128.0.0.0    |
| 255.255.255.255 |   0    |     0.0.0.0     |

[子网掩码、反掩码对照表.xlsx](https://leanote.com/api/file/getAttach?fileId=5cab234fab64415f360079d3)

梅志克斯-matrix 's Blog

常见子网掩码对照表Excel下载（反、正掩码）-数通工程师的傍身笔记

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