MULTIPLE OCN LISTING
9 prefixes in 531 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 531-211 | XXXXXXXXXX | MULT | — | — |
| 531-311 | XXXXXXXXXX | MULT | — | — |
| 531-411 | XXXXXXXXXX | MULT | — | — |
| 531-511 | XXXXXXXXXX | MULT | — | — |
| 531-555 | DIR ASST | MULT | — | — |
| 531-611 | XXXXXXXXXX | MULT | — | — |
| 531-711 | XXXXXXXXXX | MULT | — | — |
| 531-811 | XXXXXXXXXX | MULT | — | — |
| 531-911 | XXXXXXXXXX | MULT | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.