California
Area codes
2
Rate centres
23
Carriers
50
Prefix blocks
3,417
A Local Access and Transport Area is the region a call is routed within before it becomes long-haul. The boundaries were drawn when the Bell System was broken up in 1984: a local carrier could carry a call inside its LATA, and a long-distance carrier had to take it across one. The division still shapes how calls are routed and rated today, which is why every prefix block on this site carries a LATA.
50 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | 649C | 428 | 12.5% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 405 | 11.9% |
| T-MOBILE USA, INC. | 6529 | 399 | 11.7% |
| PACIFIC BELL | 9740 | 369 | 10.8% |
| METROPCS, INC. | 5562 | 315 | 9.2% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 297 | 8.7% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 217 | 6.4% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 121 | 3.5% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 91 | 2.7% |
| BHN IP ENABLED SERVICES, LLC | 045L | 70 | 2.0% |
| ONVOY SPECTRUM, LLC | 624H | 69 | 2.0% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 64 | 1.9% |
| IP HORIZON LLC | 515J | 63 | 1.8% |
| FRONTIER CALIFORNIA INC. | 4420 | 56 | 1.6% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 49 | 1.4% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 46 | 1.3% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 46 | 1.3% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | 42 | 1.2% |
| TELNYX LLC | 073H | 37 | 1.1% |
| TERRA NOVA TELECOM INC. | 145J | 37 | 1.1% |
| COMMIO, LLC | 939H | 30 | 0.9% |
| AT&T CORP. | 516C | 28 | 0.8% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 22 | 0.6% |
| FRACTEL, LLC | 965H | 21 | 0.6% |
| HD CARRIER LLC | 321J | 13 | 0.4% |
23 rate centres. search them all.