FRONTIER CALIFORNIA INC.
156 prefixes in 909 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 909-252 | S BERNDINO | 2319 | 2008-01-25 | Yes |
| 909-305 | CLAREMONT | 2319 | — | Yes |
| 909-307 | REDLANDS | 2319 | — | Yes |
| 909-335 | REDLANDS | 2319 | — | — |
| 909-336 | ARROWHEAD | 2319 | — | Yes |
| 909-337 | ARROWHEAD | 2319 | — | — |
| 909-338 | CRESTLINE | 2319 | — | — |
| 909-364 | CHINO | 2319 | — | Yes |
| 909-380 | S BERNDINO | 2319 | — | Yes |
| 909-381 | S BERNDINO | 2319 | — | — |
| 909-382 | S BERNDINO | 2319 | — | Yes |
| 909-383 | S BERNDINO | 2319 | — | — |
| 909-384 | S BERNDINO | 2319 | — | Yes |
| 909-386 | S BERNDINO | 2319 | — | — |
| 909-387 | S BERNDINO | 2319 | — | — |
| 909-388 | S BERNDINO | 2319 | — | — |
| 909-389 | MENTONE | 2319 | — | Yes |
| 909-390 | ONTARIO | 2319 | — | — |
| 909-391 | ONTARIO | 2319 | — | — |
| 909-392 | CLAREMONT | 2319 | — | — |
| 909-393 | CHINO | 2319 | — | — |
| 909-394 | CLAREMONT | 2319 | — | — |
| 909-395 | ONTARIO | 2319 | — | Yes |
| 909-396 | DIAMONDBAR | 2319 | — | — |
| 909-397 | POMONA | 2319 | — | — |
| 909-398 | CLAREMONT | 2319 | — | — |
| 909-399 | CLAREMONT | 2319 | — | — |
| 909-444 | DIAMONDBAR | 2319 | — | — |
| 909-445 | CLAREMONT | 2319 | — | Yes |
| 909-446 | CALIMESA | 2319 | — | Yes |
| 909-447 | CLAREMONT | 2319 | — | Yes |
| 909-448 | CLAREMONT | 2319 | — | — |
| 909-458 | ONTARIO | 2319 | — | Yes |
| 909-459 | ONTARIO | 2319 | — | Yes |
| 909-460 | ONTARIO | 2319 | — | Yes |
| 909-463 | ETIWANDA | 2319 | — | Yes |
| 909-464 | CHINO | 2319 | — | — |
| 909-465 | CHINO | 2319 | — | Yes |
| 909-466 | UPLAND | 2319 | — | — |
| 909-467 | ONTARIO | 2319 | — | Yes |
| 909-468 | DIAMONDBAR | 2319 | — | — |
| 909-469 | POMONA | 2319 | — | — |
| 909-473 | MARSHALL | 2319 | — | Yes |
| 909-474 | MARSHALL | 2319 | — | Yes |
| 909-475 | MARSHALL | 2319 | — | Yes |
| 909-476 | UPLAND | 2319 | — | — |
| 909-477 | UPLAND | 2319 | — | Yes |
| 909-478 | REDLANDS | 2319 | — | Yes |
| 909-480 | CLAREMONT | 2319 | — | Yes |
| 909-481 | UPLAND | 2319 | — | — |
| 909-482 | CLAREMONT | 2319 | — | — |
| 909-483 | UPLAND | 2319 | — | — |
| 909-484 | UPLAND | 2319 | — | — |
| 909-501 | S BERNDINO | 2319 | 2015-08-06 | Yes |
| 909-517 | CHINO | 2319 | — | — |
| 909-548 | CHINO | 2319 | — | Yes |
| 909-558 | REDLANDS | 2319 | — | — |
| 909-579 | UPLAND | 2319 | — | Yes |
| 909-581 | UPLAND | 2319 | — | Yes |
| 909-584 | BIGBEAR CY | 4420 | — | Yes |
| 909-585 | BIGBEAR CY | 4420 | — | — |
| 909-590 | CHINO | 2319 | — | — |
| 909-591 | CHINO | 2319 | — | — |
| 909-592 | CLAREMONT | 2319 | — | — |
| 909-593 | CLAREMONT | 2319 | — | — |
| 909-594 | DIAMONDBAR | 2319 | — | — |
| 909-595 | DIAMONDBAR | 2319 | — | — |
| 909-596 | CLAREMONT | 2319 | — | — |
| 909-597 | CHINO | 2319 | — | — |
| 909-598 | DIAMONDBAR | 2319 | — | — |
| 909-599 | CLAREMONT | 2319 | — | — |
| 909-603 | CLAREMONT | 2319 | — | — |
| 909-605 | ONTARIO | 2319 | — | Yes |
| 909-606 | CHINO | 2319 | — | — |
| 909-608 | UPLAND | 2319 | — | — |
| 909-612 | DIAMONDBAR | 2319 | — | Yes |
| 909-613 | CHINO | 2319 | — | — |
| 909-614 | CHINO | 2319 | — | Yes |
| 909-620 | POMONA | 2319 | — | — |
| 909-621 | CLAREMONT | 2319 | — | — |
| 909-622 | POMONA | 2319 | — | — |
| 909-623 | POMONA | 2319 | — | — |
| 909-624 | CLAREMONT | 2319 | — | — |
| 909-625 | CLAREMONT | 2319 | — | — |
| 909-626 | CLAREMONT | 2319 | — | — |
| 909-627 | CHINO | 2319 | — | — |
| 909-628 | CHINO | 2319 | — | — |
| 909-629 | POMONA | 2319 | — | — |
| 909-630 | POMONA | 2319 | — | Yes |
| 909-658 | S BERNDINO | 2319 | — | Yes |
| 909-673 | ONTARIO | 2319 | — | — |
| 909-748 | REDLANDS | 2319 | — | Yes |
| 909-758 | UPLAND | 2319 | — | Yes |
| 909-773 | ONTARIO | 2319 | — | Yes |
| 909-790 | CALIMESA | 2319 | — | — |
| 909-792 | REDLANDS | 2319 | — | — |
| 909-793 | REDLANDS | 2319 | — | — |
| 909-794 | MENTONE | 2319 | — | — |
| 909-795 | CALIMESA | 2319 | — | — |
| 909-796 | REDLANDS | 2319 | — | — |
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.