FORT IRWIN — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 4420 | 2 |
| ONVOY, LLC - CA | 649C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1 |
| COMMIO, LLC | 939H | 1 |