All assignees
800 prefixes in 303 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 303-400 | DENVER | 9636 | — | — |
| 303-401 | DENVER | 9636 | — | Yes |
| 303-402 | DENVER | 9636 | — | — |
| 303-403 | DENVER | 9636 | — | — |
| 303-404 | DENVER | 9636 | — | — |
| 303-405 | DENVER | 9636 | — | — |
| 303-406 | DENVER | 6118 | — | Yes |
| 303-407 | DENVER | 026D | — | — |
| 303-408 | DENVER | 6010 | — | Yes |
| 303-409 | DENVER | 6118 | — | Yes |
| 303-410 | DENVER | 9636 | — | — |
| 303-411 | XXXXXXXXXX | MULT | — | — |
| 303-412 | DENVER | 9636 | — | — |
| 303-413 | DENVER | 9636 | — | — |
| 303-414 | DENVER | 6118 | — | Yes |
| 303-415 | DENVER | 9636 | — | — |
| 303-416 | DENVER | 6118 | — | Yes |
| 303-417 | DENVER | 9636 | — | — |
| 303-418 | DENVER | 6118 | — | Yes |
| 303-419 | DENVER | 6529 | — | Yes |
| 303-420 | DENVER | 9636 | — | — |
| 303-421 | DENVER | 9636 | — | — |
| 303-422 | DENVER | 9636 | — | — |
| 303-423 | DENVER | 9636 | — | — |
| 303-424 | DENVER | 9636 | — | — |
| 303-425 | DENVER | 9636 | — | — |
| 303-426 | DENVER | 9636 | — | — |
| 303-427 | DENVER | 9636 | — | — |
| 303-428 | DENVER | 9636 | — | — |
| 303-429 | DENVER | 9636 | — | — |
| 303-430 | DENVER | 9636 | — | — |
| 303-431 | DENVER | 9636 | — | — |
| 303-432 | DENVER | 9636 | — | — |
| 303-433 | DENVER | 9636 | — | — |
| 303-434 | DENVER | 6529 | — | Yes |
| 303-435 | DENVER | 6529 | — | Yes |
| 303-436 | DENVER | 9636 | — | — |
| 303-437 | DENVER | 6529 | — | Yes |
| 303-438 | DENVER | 9636 | — | — |
| 303-439 | DENVER | 9636 | — | — |
| 303-440 | DENVER | 9636 | — | — |
| 303-441 | DENVER | 9636 | — | — |
| 303-442 | DENVER | 9636 | — | — |
| 303-443 | DENVER | 9636 | — | — |
| 303-444 | DENVER | 9636 | — | — |
| 303-445 | DENVER | 9636 | — | — |
| 303-446 | DENVER | 9636 | — | — |
| 303-447 | DENVER | 9636 | — | — |
| 303-448 | DENVER | 9636 | — | — |
| 303-449 | DENVER | 9636 | — | — |
| 303-450 | DENVER | 9636 | — | — |
| 303-451 | DENVER | 9636 | — | — |
| 303-452 | DENVER | 9636 | — | — |
| 303-453 | DENVER | 9636 | — | Yes |
| 303-454 | DENVER | 9636 | — | — |
| 303-455 | DENVER | 9636 | — | — |
| 303-456 | DENVER | 9636 | — | — |
| 303-457 | DENVER | 9636 | — | Yes |
| 303-458 | DENVER | 9636 | — | — |
| 303-459 | DENVER | 9636 | — | Yes |
| 303-460 | DENVER | 9636 | — | — |
| 303-461 | DENVER | 6630 | — | — |
| 303-462 | DENVER | 9636 | — | — |
| 303-463 | DENVER | 9636 | — | — |
| 303-464 | DENVER | 9636 | — | — |
| 303-465 | DENVER | 9636 | — | — |
| 303-466 | DENVER | 9636 | — | — |
| 303-467 | DENVER | 9636 | — | — |
| 303-468 | DENVER | 026D | — | Yes |
| 303-469 | DENVER | 9636 | — | — |
| 303-470 | DENVER | 9636 | — | — |
| 303-471 | DENVER | 9636 | — | — |
| 303-472 | DENVER | 6529 | — | Yes |
| 303-473 | DENVER | 9636 | — | — |
| 303-474 | DENVER | 7378 | — | Yes |
| 303-475 | DENVER | 6010 | — | — |
| 303-476 | DENVER | 7229 | — | Yes |
| 303-477 | DENVER | 9636 | — | — |
| 303-478 | DENVER | 6010 | — | — |
| 303-479 | DENVER | 7378 | — | Yes |
| 303-480 | DENVER | 9636 | — | — |
| 303-481 | DENVER | 7229 | — | Yes |
| 303-482 | DENVER | 6118 | — | Yes |
| 303-483 | DENVER | 6118 | — | Yes |
| 303-484 | DENVER | 7378 | — | Yes |
| 303-485 | LONGMONT | 9636 | — | — |
| 303-486 | DENVER | 9636 | — | — |
| 303-487 | DENVER | 9636 | — | — |
| 303-488 | DENVER | 9636 | — | — |
| 303-489 | DENVER | 6567 | — | — |
| 303-490 | DENVER | 6630 | — | — |
| 303-491 | DENVER | 624H | 2022-05-03 | Yes |
| 303-492 | DENVER | 9636 | — | — |
| 303-493 | DENVER | 6118 | — | Yes |
| 303-494 | DENVER | 9636 | — | — |
| 303-495 | DENVER | 7229 | — | Yes |
| 303-496 | DENVER | 7229 | 2004-04-08 | Yes |
| 303-497 | DENVER | 9636 | — | — |
| 303-498 | DENVER | 318J | 2005-04-22 | Yes |
| 303-499 | DENVER | 9636 | — | — |
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.