All assignees
304 prefixes in 475 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 475-996 | MILFORD | 639C | 2026-08-27 | Yes |
| 475-997 | CHESHIRE | 639C | 2026-07-21 | Yes |
| 475-998 | FAIRFIELD | 639C | 2026-07-08 | Yes |
| 475-999 | FAIRFIELD | 539F | 2013-02-08 | 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.