AL_PAs
Each device has an Arbitrated Loop Physical Address (AL_PA). These addresses are defined by an 8-bit field but must have neutral disparity as defined in the 8B/10B coding scheme. That reduces the number of possible values from 256 to 134. The 134 possible values have been divided between the fabric, FC_AL ports, and other special purposes as follows:
| AL_PA | Quantity | Purpose |
| 00 | 1 | FL (fabric) port |
| 01-7E | 126 | NL (normal) ports |
| F0 | 1 | Used during LIP and ARB |
| F7 | 1 | Used during LIP |
| F8 | 1 | Used during LIP |
| F9-FE | 3 | Reserved |
| FF | 1 | Used for broadcasts |
Read more about this topic: Fibre Channel Network Protocols