切分表
192.168.1.0/24 切成 /30
借 6 位，64 个子网，每个 2 台可用主机。
- 原网段
- 192.168.1.0/24
- 新掩码
- 255.255.255.252
- 子网个数
- 64（2 的 6 次方）
- 每个子网可用主机
- 2
- 块大小
- 4
算法
从 /24 到 /30，网络位多了 6 位，所以子网数是 2 的 6 次方，等于 64。主机位剩 2 位，每个子网 4 个地址，去掉网络地址和广播地址，剩 2 台。表里相邻两行的网络地址正好差一个块大小 4。
| # | 网络地址 | 首个可用 | 末个可用 | 广播地址 | 可用主机数 |
|---|---|---|---|---|---|
| 1 | 192.168.1.0/30 | 192.168.1.1 | 192.168.1.2 | 192.168.1.3 | 2 |
| 2 | 192.168.1.4/30 | 192.168.1.5 | 192.168.1.6 | 192.168.1.7 | 2 |
| 3 | 192.168.1.8/30 | 192.168.1.9 | 192.168.1.10 | 192.168.1.11 | 2 |
| 4 | 192.168.1.12/30 | 192.168.1.13 | 192.168.1.14 | 192.168.1.15 | 2 |
| 5 | 192.168.1.16/30 | 192.168.1.17 | 192.168.1.18 | 192.168.1.19 | 2 |
| 6 | 192.168.1.20/30 | 192.168.1.21 | 192.168.1.22 | 192.168.1.23 | 2 |
| 7 | 192.168.1.24/30 | 192.168.1.25 | 192.168.1.26 | 192.168.1.27 | 2 |
| 8 | 192.168.1.28/30 | 192.168.1.29 | 192.168.1.30 | 192.168.1.31 | 2 |
| 9 | 192.168.1.32/30 | 192.168.1.33 | 192.168.1.34 | 192.168.1.35 | 2 |
| 10 | 192.168.1.36/30 | 192.168.1.37 | 192.168.1.38 | 192.168.1.39 | 2 |
| 11 | 192.168.1.40/30 | 192.168.1.41 | 192.168.1.42 | 192.168.1.43 | 2 |
| 12 | 192.168.1.44/30 | 192.168.1.45 | 192.168.1.46 | 192.168.1.47 | 2 |
| 13 | 192.168.1.48/30 | 192.168.1.49 | 192.168.1.50 | 192.168.1.51 | 2 |
| 14 | 192.168.1.52/30 | 192.168.1.53 | 192.168.1.54 | 192.168.1.55 | 2 |
| 15 | 192.168.1.56/30 | 192.168.1.57 | 192.168.1.58 | 192.168.1.59 | 2 |
| 16 | 192.168.1.60/30 | 192.168.1.61 | 192.168.1.62 | 192.168.1.63 | 2 |
| 17 | 192.168.1.64/30 | 192.168.1.65 | 192.168.1.66 | 192.168.1.67 | 2 |
| 18 | 192.168.1.68/30 | 192.168.1.69 | 192.168.1.70 | 192.168.1.71 | 2 |
| 19 | 192.168.1.72/30 | 192.168.1.73 | 192.168.1.74 | 192.168.1.75 | 2 |
| 20 | 192.168.1.76/30 | 192.168.1.77 | 192.168.1.78 | 192.168.1.79 | 2 |
| 21 | 192.168.1.80/30 | 192.168.1.81 | 192.168.1.82 | 192.168.1.83 | 2 |
| 22 | 192.168.1.84/30 | 192.168.1.85 | 192.168.1.86 | 192.168.1.87 | 2 |
| 23 | 192.168.1.88/30 | 192.168.1.89 | 192.168.1.90 | 192.168.1.91 | 2 |
| 24 | 192.168.1.92/30 | 192.168.1.93 | 192.168.1.94 | 192.168.1.95 | 2 |
| 25 | 192.168.1.96/30 | 192.168.1.97 | 192.168.1.98 | 192.168.1.99 | 2 |
| 26 | 192.168.1.100/30 | 192.168.1.101 | 192.168.1.102 | 192.168.1.103 | 2 |
| 27 | 192.168.1.104/30 | 192.168.1.105 | 192.168.1.106 | 192.168.1.107 | 2 |
| 28 | 192.168.1.108/30 | 192.168.1.109 | 192.168.1.110 | 192.168.1.111 | 2 |
| 29 | 192.168.1.112/30 | 192.168.1.113 | 192.168.1.114 | 192.168.1.115 | 2 |
| 30 | 192.168.1.116/30 | 192.168.1.117 | 192.168.1.118 | 192.168.1.119 | 2 |
| 31 | 192.168.1.120/30 | 192.168.1.121 | 192.168.1.122 | 192.168.1.123 | 2 |
| 32 | 192.168.1.124/30 | 192.168.1.125 | 192.168.1.126 | 192.168.1.127 | 2 |
| 33 | 192.168.1.128/30 | 192.168.1.129 | 192.168.1.130 | 192.168.1.131 | 2 |
| 34 | 192.168.1.132/30 | 192.168.1.133 | 192.168.1.134 | 192.168.1.135 | 2 |
| 35 | 192.168.1.136/30 | 192.168.1.137 | 192.168.1.138 | 192.168.1.139 | 2 |
| 36 | 192.168.1.140/30 | 192.168.1.141 | 192.168.1.142 | 192.168.1.143 | 2 |
| 37 | 192.168.1.144/30 | 192.168.1.145 | 192.168.1.146 | 192.168.1.147 | 2 |
| 38 | 192.168.1.148/30 | 192.168.1.149 | 192.168.1.150 | 192.168.1.151 | 2 |
| 39 | 192.168.1.152/30 | 192.168.1.153 | 192.168.1.154 | 192.168.1.155 | 2 |
| 40 | 192.168.1.156/30 | 192.168.1.157 | 192.168.1.158 | 192.168.1.159 | 2 |
| 41 | 192.168.1.160/30 | 192.168.1.161 | 192.168.1.162 | 192.168.1.163 | 2 |
| 42 | 192.168.1.164/30 | 192.168.1.165 | 192.168.1.166 | 192.168.1.167 | 2 |
| 43 | 192.168.1.168/30 | 192.168.1.169 | 192.168.1.170 | 192.168.1.171 | 2 |
| 44 | 192.168.1.172/30 | 192.168.1.173 | 192.168.1.174 | 192.168.1.175 | 2 |
| 45 | 192.168.1.176/30 | 192.168.1.177 | 192.168.1.178 | 192.168.1.179 | 2 |
| 46 | 192.168.1.180/30 | 192.168.1.181 | 192.168.1.182 | 192.168.1.183 | 2 |
| 47 | 192.168.1.184/30 | 192.168.1.185 | 192.168.1.186 | 192.168.1.187 | 2 |
| 48 | 192.168.1.188/30 | 192.168.1.189 | 192.168.1.190 | 192.168.1.191 | 2 |
| 49 | 192.168.1.192/30 | 192.168.1.193 | 192.168.1.194 | 192.168.1.195 | 2 |
| 50 | 192.168.1.196/30 | 192.168.1.197 | 192.168.1.198 | 192.168.1.199 | 2 |
| 51 | 192.168.1.200/30 | 192.168.1.201 | 192.168.1.202 | 192.168.1.203 | 2 |
| 52 | 192.168.1.204/30 | 192.168.1.205 | 192.168.1.206 | 192.168.1.207 | 2 |
| 53 | 192.168.1.208/30 | 192.168.1.209 | 192.168.1.210 | 192.168.1.211 | 2 |
| 54 | 192.168.1.212/30 | 192.168.1.213 | 192.168.1.214 | 192.168.1.215 | 2 |
| 55 | 192.168.1.216/30 | 192.168.1.217 | 192.168.1.218 | 192.168.1.219 | 2 |
| 56 | 192.168.1.220/30 | 192.168.1.221 | 192.168.1.222 | 192.168.1.223 | 2 |
| 57 | 192.168.1.224/30 | 192.168.1.225 | 192.168.1.226 | 192.168.1.227 | 2 |
| 58 | 192.168.1.228/30 | 192.168.1.229 | 192.168.1.230 | 192.168.1.231 | 2 |
| 59 | 192.168.1.232/30 | 192.168.1.233 | 192.168.1.234 | 192.168.1.235 | 2 |
| 60 | 192.168.1.236/30 | 192.168.1.237 | 192.168.1.238 | 192.168.1.239 | 2 |
| 61 | 192.168.1.240/30 | 192.168.1.241 | 192.168.1.242 | 192.168.1.243 | 2 |
| 62 | 192.168.1.244/30 | 192.168.1.245 | 192.168.1.246 | 192.168.1.247 | 2 |
| 63 | 192.168.1.248/30 | 192.168.1.249 | 192.168.1.250 | 192.168.1.251 | 2 |
| 64 | 192.168.1.252/30 | 192.168.1.253 | 192.168.1.254 | 192.168.1.255 | 2 |