ALTA — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| AT&T ENTERPRISES, LLC | 516C | 1 |
| ONVOY, LLC - CA | 649C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 1 |
| PACIFIC BELL | 9740 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| AT&T ENTERPRISES, LLC | 516C | 1 |
| ONVOY, LLC - CA | 649C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 1 |
| PACIFIC BELL | 9740 | 1 |