AMERICAN MESSAGING SERVICES, LLC
11 prefixes in 303 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 303-203 | DENVER | 9748 | — | — |
| 303-212 | DENVER | 9748 | — | — |
| 303-259 | DENVER | 9748 | — | — |
| 303-310 | DENVER | 9748 | — | — |
| 303-508 | DENVER | 9748 | — | — |
| 303-509 | DENVER | 9748 | — | — |
| 303-510 | DENVER | 9748 | — | — |
| 303-528 | DENVER | 9748 | — | — |
| 303-559 | DENVER | 9748 | — | — |
| 303-580 | DENVER | 9748 | — | — |
| 303-767 | DENVER | 9748 | — | — |
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.