California
Area codes
2
Rate centres
18
Carriers
44
Prefix blocks
2,051
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.
44 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| PACIFIC BELL | 9740 | 342 | 16.7% |
| ONVOY, LLC - CA | 649C | 267 | 13.0% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 234 | 11.4% |
| METROPCS, INC. | 5562 | 173 | 8.4% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 167 | 8.1% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 146 | 7.1% |
| T-MOBILE USA, INC. | 6529 | 136 | 6.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 85 | 4.1% |
| IP HORIZON LLC | 515J | 67 | 3.3% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 64 | 3.1% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 36 | 1.8% |
| ONVOY SPECTRUM, LLC | 624H | 34 | 1.7% |
| TELNYX LLC | 073H | 29 | 1.4% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 27 | 1.3% |
| TERRA NOVA TELECOM INC. | 145J | 26 | 1.3% |
| AT&T CORP. | 516C | 23 | 1.1% |
| COMMIO, LLC | 939H | 23 | 1.1% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 20 | 1.0% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 19 | 0.9% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 19 | 0.9% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 16 | 0.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 14 | 0.7% |
| FRACTEL, LLC | 965H | 10 | 0.5% |
| NUSO, LLC | 732J | 10 | 0.5% |
| HD CARRIER LLC | 321J | 9 | 0.4% |
18 rate centres. search them all.