| Last Byte | What | Why |
| Addresses | Happens | |
| to Them | ||
| 0 | invalid | first subnet address |
| 1-30 | valid | hosts on first subnet |
| 31 | invalid | broadcast address of first subnet |
| 32 | invalid | first <f“Symbol”><\#174> second, etc. |
| 224 | invalid | eighth subnet address |
| 225-254 | valid | hosts for eighth subnet |
| 255 | invalid | broadcast for eighth subnet |