切分表
172.16.0.0/16 切成 /24
借 8 位，256 个子网，每个 254 台可用主机。
- 原网段
- 172.16.0.0/16
- 新掩码
- 255.255.255.0
- 子网个数
- 256（2 的 8 次方）
- 每个子网可用主机
- 254
- 块大小
- 1
算法
从 /16 到 /24，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 8 位，每个子网 256 个地址，去掉网络地址和广播地址，剩 254 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 | 172.16.0.0/24 | 172.16.0.1 | 172.16.0.254 | 172.16.0.255 | 254 |
| 2 | 172.16.1.0/24 | 172.16.1.1 | 172.16.1.254 | 172.16.1.255 | 254 |
| 3 | 172.16.2.0/24 | 172.16.2.1 | 172.16.2.254 | 172.16.2.255 | 254 |
| 4 | 172.16.3.0/24 | 172.16.3.1 | 172.16.3.254 | 172.16.3.255 | 254 |
| 5 | 172.16.4.0/24 | 172.16.4.1 | 172.16.4.254 | 172.16.4.255 | 254 |
| 6 | 172.16.5.0/24 | 172.16.5.1 | 172.16.5.254 | 172.16.5.255 | 254 |
| 7 | 172.16.6.0/24 | 172.16.6.1 | 172.16.6.254 | 172.16.6.255 | 254 |
| 8 | 172.16.7.0/24 | 172.16.7.1 | 172.16.7.254 | 172.16.7.255 | 254 |
| 9 | 172.16.8.0/24 | 172.16.8.1 | 172.16.8.254 | 172.16.8.255 | 254 |
| 10 | 172.16.9.0/24 | 172.16.9.1 | 172.16.9.254 | 172.16.9.255 | 254 |
| 11 | 172.16.10.0/24 | 172.16.10.1 | 172.16.10.254 | 172.16.10.255 | 254 |
| 12 | 172.16.11.0/24 | 172.16.11.1 | 172.16.11.254 | 172.16.11.255 | 254 |
| 13 | 172.16.12.0/24 | 172.16.12.1 | 172.16.12.254 | 172.16.12.255 | 254 |
| 14 | 172.16.13.0/24 | 172.16.13.1 | 172.16.13.254 | 172.16.13.255 | 254 |
| 15 | 172.16.14.0/24 | 172.16.14.1 | 172.16.14.254 | 172.16.14.255 | 254 |
| 16 | 172.16.15.0/24 | 172.16.15.1 | 172.16.15.254 | 172.16.15.255 | 254 |
| 17 | 172.16.16.0/24 | 172.16.16.1 | 172.16.16.254 | 172.16.16.255 | 254 |
| 18 | 172.16.17.0/24 | 172.16.17.1 | 172.16.17.254 | 172.16.17.255 | 254 |
| 19 | 172.16.18.0/24 | 172.16.18.1 | 172.16.18.254 | 172.16.18.255 | 254 |
| 20 | 172.16.19.0/24 | 172.16.19.1 | 172.16.19.254 | 172.16.19.255 | 254 |
| 21 | 172.16.20.0/24 | 172.16.20.1 | 172.16.20.254 | 172.16.20.255 | 254 |
| 22 | 172.16.21.0/24 | 172.16.21.1 | 172.16.21.254 | 172.16.21.255 | 254 |
| 23 | 172.16.22.0/24 | 172.16.22.1 | 172.16.22.254 | 172.16.22.255 | 254 |
| 24 | 172.16.23.0/24 | 172.16.23.1 | 172.16.23.254 | 172.16.23.255 | 254 |
| 25 | 172.16.24.0/24 | 172.16.24.1 | 172.16.24.254 | 172.16.24.255 | 254 |
| 26 | 172.16.25.0/24 | 172.16.25.1 | 172.16.25.254 | 172.16.25.255 | 254 |
| 27 | 172.16.26.0/24 | 172.16.26.1 | 172.16.26.254 | 172.16.26.255 | 254 |
| 28 | 172.16.27.0/24 | 172.16.27.1 | 172.16.27.254 | 172.16.27.255 | 254 |
| 29 | 172.16.28.0/24 | 172.16.28.1 | 172.16.28.254 | 172.16.28.255 | 254 |
| 30 | 172.16.29.0/24 | 172.16.29.1 | 172.16.29.254 | 172.16.29.255 | 254 |
| 31 | 172.16.30.0/24 | 172.16.30.1 | 172.16.30.254 | 172.16.30.255 | 254 |
| 32 | 172.16.31.0/24 | 172.16.31.1 | 172.16.31.254 | 172.16.31.255 | 254 |
| 33 | 172.16.32.0/24 | 172.16.32.1 | 172.16.32.254 | 172.16.32.255 | 254 |
| 34 | 172.16.33.0/24 | 172.16.33.1 | 172.16.33.254 | 172.16.33.255 | 254 |
| 35 | 172.16.34.0/24 | 172.16.34.1 | 172.16.34.254 | 172.16.34.255 | 254 |
| 36 | 172.16.35.0/24 | 172.16.35.1 | 172.16.35.254 | 172.16.35.255 | 254 |
| 37 | 172.16.36.0/24 | 172.16.36.1 | 172.16.36.254 | 172.16.36.255 | 254 |
| 38 | 172.16.37.0/24 | 172.16.37.1 | 172.16.37.254 | 172.16.37.255 | 254 |
| 39 | 172.16.38.0/24 | 172.16.38.1 | 172.16.38.254 | 172.16.38.255 | 254 |
| 40 | 172.16.39.0/24 | 172.16.39.1 | 172.16.39.254 | 172.16.39.255 | 254 |
| 41 | 172.16.40.0/24 | 172.16.40.1 | 172.16.40.254 | 172.16.40.255 | 254 |
| 42 | 172.16.41.0/24 | 172.16.41.1 | 172.16.41.254 | 172.16.41.255 | 254 |
| 43 | 172.16.42.0/24 | 172.16.42.1 | 172.16.42.254 | 172.16.42.255 | 254 |
| 44 | 172.16.43.0/24 | 172.16.43.1 | 172.16.43.254 | 172.16.43.255 | 254 |
| 45 | 172.16.44.0/24 | 172.16.44.1 | 172.16.44.254 | 172.16.44.255 | 254 |
| 46 | 172.16.45.0/24 | 172.16.45.1 | 172.16.45.254 | 172.16.45.255 | 254 |
| 47 | 172.16.46.0/24 | 172.16.46.1 | 172.16.46.254 | 172.16.46.255 | 254 |
| 48 | 172.16.47.0/24 | 172.16.47.1 | 172.16.47.254 | 172.16.47.255 | 254 |
| 49 | 172.16.48.0/24 | 172.16.48.1 | 172.16.48.254 | 172.16.48.255 | 254 |
| 50 | 172.16.49.0/24 | 172.16.49.1 | 172.16.49.254 | 172.16.49.255 | 254 |
| 51 | 172.16.50.0/24 | 172.16.50.1 | 172.16.50.254 | 172.16.50.255 | 254 |
| 52 | 172.16.51.0/24 | 172.16.51.1 | 172.16.51.254 | 172.16.51.255 | 254 |
| 53 | 172.16.52.0/24 | 172.16.52.1 | 172.16.52.254 | 172.16.52.255 | 254 |
| 54 | 172.16.53.0/24 | 172.16.53.1 | 172.16.53.254 | 172.16.53.255 | 254 |
| 55 | 172.16.54.0/24 | 172.16.54.1 | 172.16.54.254 | 172.16.54.255 | 254 |
| 56 | 172.16.55.0/24 | 172.16.55.1 | 172.16.55.254 | 172.16.55.255 | 254 |
| 57 | 172.16.56.0/24 | 172.16.56.1 | 172.16.56.254 | 172.16.56.255 | 254 |
| 58 | 172.16.57.0/24 | 172.16.57.1 | 172.16.57.254 | 172.16.57.255 | 254 |
| 59 | 172.16.58.0/24 | 172.16.58.1 | 172.16.58.254 | 172.16.58.255 | 254 |
| 60 | 172.16.59.0/24 | 172.16.59.1 | 172.16.59.254 | 172.16.59.255 | 254 |
| 61 | 172.16.60.0/24 | 172.16.60.1 | 172.16.60.254 | 172.16.60.255 | 254 |
| 62 | 172.16.61.0/24 | 172.16.61.1 | 172.16.61.254 | 172.16.61.255 | 254 |
| 63 | 172.16.62.0/24 | 172.16.62.1 | 172.16.62.254 | 172.16.62.255 | 254 |
| 64 | 172.16.63.0/24 | 172.16.63.1 | 172.16.63.254 | 172.16.63.255 | 254 |
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。