FRONTIER CALIFORNIA INC.
137 prefixes in 310 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 310-206 | W ANGELES | 2319 | — | — |
| 310-207 | W ANGELES | 2319 | — | — |
| 310-208 | W ANGELES | 2319 | — | Yes |
| 310-209 | W ANGELES | 2319 | — | Yes |
| 310-214 | REDONDO | 2319 | — | — |
| 310-230 | SNMN SNMN | 2319 | — | Yes |
| 310-231 | W ANGELES | 2319 | — | — |
| 310-234 | W ANGELES | 2319 | — | — |
| 310-235 | W ANGELES | 2319 | — | — |
| 310-260 | SNMN SNMN | 2319 | — | — |
| 310-264 | SNMN SNMN | 2319 | — | — |
| 310-265 | REDONDO | 2319 | — | Yes |
| 310-267 | SNMN SNMN | 2319 | — | — |
| 310-268 | W ANGELES | 2319 | — | — |
| 310-301 | SNMN MRVS | 2319 | — | — |
| 310-302 | SNMN MRVS | 2319 | — | Yes |
| 310-305 | SNMN MRVS | 2319 | — | — |
| 310-306 | SNMN MRVS | 2319 | — | — |
| 310-312 | W ANGELES | 2319 | — | — |
| 310-313 | SNMN MRVS | 2319 | — | — |
| 310-314 | SNMN SNMN | 2319 | — | — |
| 310-315 | SNMN SNMN | 2319 | — | — |
| 310-316 | REDONDO | 2319 | — | — |
| 310-317 | MALIBU | 2319 | — | Yes |
| 310-318 | REDONDO | 2319 | — | Yes |
| 310-319 | SNMN SNMN | 2319 | — | — |
| 310-370 | REDONDO | 2319 | — | — |
| 310-371 | REDONDO | 2319 | — | — |
| 310-372 | REDONDO | 2319 | — | — |
| 310-373 | REDONDO | 2319 | — | — |
| 310-374 | REDONDO | 2319 | — | — |
| 310-375 | REDONDO | 2319 | — | — |
| 310-376 | REDONDO | 2319 | — | — |
| 310-377 | REDONDO | 2319 | — | — |
| 310-378 | REDONDO | 2319 | — | — |
| 310-379 | REDONDO | 2319 | — | — |
| 310-390 | SNMN MRVS | 2319 | — | — |
| 310-391 | SNMN MRVS | 2319 | — | — |
| 310-392 | SNMN SNMN | 2319 | — | — |
| 310-393 | SNMN SNMN | 2319 | — | — |
| 310-394 | SNMN SNMN | 2319 | — | — |
| 310-395 | SNMN SNMN | 2319 | — | — |
| 310-396 | SNMN SNMN | 2319 | — | — |
| 310-397 | SNMN MRVS | 2319 | — | — |
| 310-398 | SNMN MRVS | 2319 | — | — |
| 310-399 | SNMN SNMN | 2319 | — | — |
| 310-406 | REDONDO | 2319 | — | Yes |
| 310-434 | SNMN SNMN | 2319 | — | — |
| 310-439 | SNMN MRVS | 2319 | — | Yes |
| 310-440 | W ANGELES | 2319 | — | — |
| 310-441 | W ANGELES | 2319 | — | — |
| 310-442 | W ANGELES | 2319 | — | — |
| 310-443 | W ANGELES | 2319 | — | — |
| 310-444 | W ANGELES | 2319 | — | — |
| 310-445 | W ANGELES | 2319 | — | — |
| 310-446 | W ANGELES | 2319 | — | — |
| 310-447 | W ANGELES | 2319 | — | Yes |
| 310-448 | SNMN MRVS | 2319 | — | Yes |
| 310-449 | SNMN SNMN | 2319 | — | — |
| 310-450 | SNMN SNMN | 2319 | — | — |
| 310-451 | SNMN SNMN | 2319 | — | — |
| 310-452 | SNMN SNMN | 2319 | — | — |
| 310-453 | SNMN SNMN | 2319 | — | — |
| 310-454 | SNMN SNMN | 2319 | — | — |
| 310-455 | SNMN SNMN | 2319 | — | Yes |
| 310-456 | MALIBU | 2319 | — | Yes |
| 310-457 | MALIBU | 2319 | — | — |
| 310-458 | SNMN SNMN | 2319 | — | — |
| 310-459 | SNMN SNMN | 2319 | — | — |
| 310-465 | REDONDO | 2319 | — | Yes |
| 310-470 | W ANGELES | 2319 | — | — |
| 310-471 | W ANGELES | 2319 | — | — |
| 310-472 | W ANGELES | 2319 | — | — |
| 310-473 | W ANGELES | 2319 | — | — |
| 310-474 | W ANGELES | 2319 | — | — |
| 310-475 | W ANGELES | 2319 | — | — |
| 310-476 | W ANGELES | 2319 | — | — |
| 310-477 | W ANGELES | 2319 | — | — |
| 310-478 | W ANGELES | 2319 | — | — |
| 310-479 | W ANGELES | 2319 | — | — |
| 310-540 | REDONDO | 2319 | — | — |
| 310-541 | REDONDO | 2319 | — | — |
| 310-542 | REDONDO | 2319 | — | — |
| 310-543 | REDONDO | 2319 | — | — |
| 310-544 | REDONDO | 2319 | — | — |
| 310-545 | REDONDO | 2319 | — | — |
| 310-546 | REDONDO | 2319 | — | — |
| 310-570 | SNMN SNMN | 2319 | — | Yes |
| 310-571 | W ANGELES | 2319 | — | Yes |
| 310-572 | SNMN MRVS | 2319 | — | — |
| 310-573 | SNMN SNMN | 2319 | — | Yes |
| 310-574 | SNMN MRVS | 2319 | — | Yes |
| 310-575 | W ANGELES | 2319 | — | Yes |
| 310-576 | SNMN SNMN | 2319 | — | — |
| 310-577 | SNMN MRVS | 2319 | — | — |
| 310-578 | SNMN MRVS | 2319 | — | — |
| 310-581 | SNMN SNMN | 2319 | — | — |
| 310-582 | SNMN SNMN | 2319 | — | Yes |
| 310-584 | SNMN SNMN | 2319 | — | Yes |
| 310-586 | SNMN SNMN | 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.