All assignees
708 prefixes in 657 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 657-958 | — | — | ||
| 657-959 | — | — | ||
| 657-966 | SANTA ANA | 965H | 2020-09-21 | Yes |
| 657-976 | — | — | ||
| 657-977 | WESTMINSTR | 965H | 2019-05-13 | Yes |
| 657-997 | ANAHEIM | 6006 | 2026-05-11 | Yes |
| 657-998 | SANTA ANA | 6006 | 2026-05-08 | Yes |
| 657-999 | ANAHEIM | 981E | — | Yes |
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.