IPv4范围扩展器
给定起始和结束IPv4地址，此工具使用其CIDR表示法计算有效的IPv4网络。
| old value | new value | |
|---|---|---|
| Start address | 192.168.1.1 | 192.168.0.0 |
| End address | 192.168.6.255 | 192.168.7.255 |
| Addresses in range | 1,535 | 2,048 |
| CIDR | 192.168.0.0/21 |
| old value | new value | |
|---|---|---|
| Start address | 192.168.1.1 | 192.168.0.0 |
| End address | 192.168.6.255 | 192.168.7.255 |
| Addresses in range | 1,535 | 2,048 |
| CIDR | 192.168.0.0/21 |
