切分表
10.0.0.0/8 切成 /16
借 8 位，256 个子网，每个 65,534 台可用主机。
- 原网段
- 10.0.0.0/8
- 新掩码
- 255.255.0.0
- 子网个数
- 256（2 的 8 次方）
- 每个子网可用主机
- 65,534
- 块大小
- 1
算法
从 /8 到 /16，网络位多了 8 位，所以子网数是 2 的 8 次方，等于 256。主机位剩 16 位，每个子网 65,536 个地址，去掉网络地址和广播地址，剩 65,534 台。表里相邻两行的网络地址正好差一个块大小 1。
| # | 网络地址 | 首个可用 | 末个可用 | 广播地址 | 可用主机数 |
|---|---|---|---|---|---|
| 1 | 10.0.0.0/16 | 10.0.0.1 | 10.0.255.254 | 10.0.255.255 | 65,534 |
| 2 | 10.1.0.0/16 | 10.1.0.1 | 10.1.255.254 | 10.1.255.255 | 65,534 |
| 3 | 10.2.0.0/16 | 10.2.0.1 | 10.2.255.254 | 10.2.255.255 | 65,534 |
| 4 | 10.3.0.0/16 | 10.3.0.1 | 10.3.255.254 | 10.3.255.255 | 65,534 |
| 5 | 10.4.0.0/16 | 10.4.0.1 | 10.4.255.254 | 10.4.255.255 | 65,534 |
| 6 | 10.5.0.0/16 | 10.5.0.1 | 10.5.255.254 | 10.5.255.255 | 65,534 |
| 7 | 10.6.0.0/16 | 10.6.0.1 | 10.6.255.254 | 10.6.255.255 | 65,534 |
| 8 | 10.7.0.0/16 | 10.7.0.1 | 10.7.255.254 | 10.7.255.255 | 65,534 |
| 9 | 10.8.0.0/16 | 10.8.0.1 | 10.8.255.254 | 10.8.255.255 | 65,534 |
| 10 | 10.9.0.0/16 | 10.9.0.1 | 10.9.255.254 | 10.9.255.255 | 65,534 |
| 11 | 10.10.0.0/16 | 10.10.0.1 | 10.10.255.254 | 10.10.255.255 | 65,534 |
| 12 | 10.11.0.0/16 | 10.11.0.1 | 10.11.255.254 | 10.11.255.255 | 65,534 |
| 13 | 10.12.0.0/16 | 10.12.0.1 | 10.12.255.254 | 10.12.255.255 | 65,534 |
| 14 | 10.13.0.0/16 | 10.13.0.1 | 10.13.255.254 | 10.13.255.255 | 65,534 |
| 15 | 10.14.0.0/16 | 10.14.0.1 | 10.14.255.254 | 10.14.255.255 | 65,534 |
| 16 | 10.15.0.0/16 | 10.15.0.1 | 10.15.255.254 | 10.15.255.255 | 65,534 |
| 17 | 10.16.0.0/16 | 10.16.0.1 | 10.16.255.254 | 10.16.255.255 | 65,534 |
| 18 | 10.17.0.0/16 | 10.17.0.1 | 10.17.255.254 | 10.17.255.255 | 65,534 |
| 19 | 10.18.0.0/16 | 10.18.0.1 | 10.18.255.254 | 10.18.255.255 | 65,534 |
| 20 | 10.19.0.0/16 | 10.19.0.1 | 10.19.255.254 | 10.19.255.255 | 65,534 |
| 21 | 10.20.0.0/16 | 10.20.0.1 | 10.20.255.254 | 10.20.255.255 | 65,534 |
| 22 | 10.21.0.0/16 | 10.21.0.1 | 10.21.255.254 | 10.21.255.255 | 65,534 |
| 23 | 10.22.0.0/16 | 10.22.0.1 | 10.22.255.254 | 10.22.255.255 | 65,534 |
| 24 | 10.23.0.0/16 | 10.23.0.1 | 10.23.255.254 | 10.23.255.255 | 65,534 |
| 25 | 10.24.0.0/16 | 10.24.0.1 | 10.24.255.254 | 10.24.255.255 | 65,534 |
| 26 | 10.25.0.0/16 | 10.25.0.1 | 10.25.255.254 | 10.25.255.255 | 65,534 |
| 27 | 10.26.0.0/16 | 10.26.0.1 | 10.26.255.254 | 10.26.255.255 | 65,534 |
| 28 | 10.27.0.0/16 | 10.27.0.1 | 10.27.255.254 | 10.27.255.255 | 65,534 |
| 29 | 10.28.0.0/16 | 10.28.0.1 | 10.28.255.254 | 10.28.255.255 | 65,534 |
| 30 | 10.29.0.0/16 | 10.29.0.1 | 10.29.255.254 | 10.29.255.255 | 65,534 |
| 31 | 10.30.0.0/16 | 10.30.0.1 | 10.30.255.254 | 10.30.255.255 | 65,534 |
| 32 | 10.31.0.0/16 | 10.31.0.1 | 10.31.255.254 | 10.31.255.255 | 65,534 |
| 33 | 10.32.0.0/16 | 10.32.0.1 | 10.32.255.254 | 10.32.255.255 | 65,534 |
| 34 | 10.33.0.0/16 | 10.33.0.1 | 10.33.255.254 | 10.33.255.255 | 65,534 |
| 35 | 10.34.0.0/16 | 10.34.0.1 | 10.34.255.254 | 10.34.255.255 | 65,534 |
| 36 | 10.35.0.0/16 | 10.35.0.1 | 10.35.255.254 | 10.35.255.255 | 65,534 |
| 37 | 10.36.0.0/16 | 10.36.0.1 | 10.36.255.254 | 10.36.255.255 | 65,534 |
| 38 | 10.37.0.0/16 | 10.37.0.1 | 10.37.255.254 | 10.37.255.255 | 65,534 |
| 39 | 10.38.0.0/16 | 10.38.0.1 | 10.38.255.254 | 10.38.255.255 | 65,534 |
| 40 | 10.39.0.0/16 | 10.39.0.1 | 10.39.255.254 | 10.39.255.255 | 65,534 |
| 41 | 10.40.0.0/16 | 10.40.0.1 | 10.40.255.254 | 10.40.255.255 | 65,534 |
| 42 | 10.41.0.0/16 | 10.41.0.1 | 10.41.255.254 | 10.41.255.255 | 65,534 |
| 43 | 10.42.0.0/16 | 10.42.0.1 | 10.42.255.254 | 10.42.255.255 | 65,534 |
| 44 | 10.43.0.0/16 | 10.43.0.1 | 10.43.255.254 | 10.43.255.255 | 65,534 |
| 45 | 10.44.0.0/16 | 10.44.0.1 | 10.44.255.254 | 10.44.255.255 | 65,534 |
| 46 | 10.45.0.0/16 | 10.45.0.1 | 10.45.255.254 | 10.45.255.255 | 65,534 |
| 47 | 10.46.0.0/16 | 10.46.0.1 | 10.46.255.254 | 10.46.255.255 | 65,534 |
| 48 | 10.47.0.0/16 | 10.47.0.1 | 10.47.255.254 | 10.47.255.255 | 65,534 |
| 49 | 10.48.0.0/16 | 10.48.0.1 | 10.48.255.254 | 10.48.255.255 | 65,534 |
| 50 | 10.49.0.0/16 | 10.49.0.1 | 10.49.255.254 | 10.49.255.255 | 65,534 |
| 51 | 10.50.0.0/16 | 10.50.0.1 | 10.50.255.254 | 10.50.255.255 | 65,534 |
| 52 | 10.51.0.0/16 | 10.51.0.1 | 10.51.255.254 | 10.51.255.255 | 65,534 |
| 53 | 10.52.0.0/16 | 10.52.0.1 | 10.52.255.254 | 10.52.255.255 | 65,534 |
| 54 | 10.53.0.0/16 | 10.53.0.1 | 10.53.255.254 | 10.53.255.255 | 65,534 |
| 55 | 10.54.0.0/16 | 10.54.0.1 | 10.54.255.254 | 10.54.255.255 | 65,534 |
| 56 | 10.55.0.0/16 | 10.55.0.1 | 10.55.255.254 | 10.55.255.255 | 65,534 |
| 57 | 10.56.0.0/16 | 10.56.0.1 | 10.56.255.254 | 10.56.255.255 | 65,534 |
| 58 | 10.57.0.0/16 | 10.57.0.1 | 10.57.255.254 | 10.57.255.255 | 65,534 |
| 59 | 10.58.0.0/16 | 10.58.0.1 | 10.58.255.254 | 10.58.255.255 | 65,534 |
| 60 | 10.59.0.0/16 | 10.59.0.1 | 10.59.255.254 | 10.59.255.255 | 65,534 |
| 61 | 10.60.0.0/16 | 10.60.0.1 | 10.60.255.254 | 10.60.255.255 | 65,534 |
| 62 | 10.61.0.0/16 | 10.61.0.1 | 10.61.255.254 | 10.61.255.255 | 65,534 |
| 63 | 10.62.0.0/16 | 10.62.0.1 | 10.62.255.254 | 10.62.255.255 | 65,534 |
| 64 | 10.63.0.0/16 | 10.63.0.1 | 10.63.255.254 | 10.63.255.255 | 65,534 |
只列出前 64 个，共 256 个子网。规律不变：下一个网络地址等于上一个加块大小。