| Reserved ranges |
| 10.0.0.0 – 10.255.255.255 |
| 127.0.0.0 – 127.255.255.255 |
| 172.16.0.0 – 172.16.255.255 |
| 192.168.0.0 – 192.168.255.255 |
| Classful IP ranges | ||
| A | 0.0.0.0 – 127.255.255.255 | |
| B | 128.0.0.0 – 191.255.255.255 | |
| C | 192.0.0.0 – 223.255.255.255 | |
| D | 224.0.0.0 – 239.255.255.255 | |
| E | 240.0.0.0 – 255.255.255.255 | |
| Subnetting IPv4 | ||
| /31 | 255.255.255.254 | 1 Host |
| /30 | 255.255.255.252 | 2 Hosts |
| /29 | 255.255.255.248 | 6 Hosts |
| /28 | 255.255.255.240 | 14 Hosts |
| /27 | 255.255.255.224 | 30 Hosts |
| /26 | 255.255.255.192 | 62 Hosts |
| /25 | 255.255.255.128 | 126 Hosts |
| /24 | 255.255.255.0 | 254 Hosts |
| /23 | 255.255.254.0 | 510 Hosts |
| /22 | 255.255.252.0 | 1022 Hosts |
| /21 | 255.255.248.0 | 2046 Hosts |
| /20 | 255.255.240.0 | 4094 Hosts |
| /19 | 255.255.224.0 | 8190 Hosts |
| /18 | 255.255.192.0 | 16382 Hosts |
| /17 | 255.255.128.0 | 32766 Hosts |
| /16 | 255.255.0.0 | 65534 Hosts |
| /15 | 255.254.0.0 | 131070 Hosts |
| /14 | 255.252.0.0 | 262142 Hosts |
| /13 | 255.248.0.0 | 524286 Hosts |
| /12 | 255.240.0.0 | 1048574 Hosts |
| /11 | 255.224.0.0 | 2097150 Hosts |
| /10 | 255.192.0.0 | 4194302 Hosts |
| /9 | 255.128.0.0 | 8388606 Hosts |
| /8 | 255.0.0.0 | 16777214 Hosts |