California
Area codes
3
Rate centres
60
Carriers
53
Prefix blocks
6,631
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.
53 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1,445 | 21.8% |
| PACIFIC BELL | 9740 | 809 | 12.2% |
| ONVOY, LLC - CA | 649C | 743 | 11.2% |
| T-MOBILE USA, INC. | 6529 | 661 | 10.0% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 637 | 9.6% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 390 | 5.9% |
| METROPCS, INC. | 5562 | 339 | 5.1% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 226 | 3.4% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 149 | 2.2% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 149 | 2.2% |
| ONVOY SPECTRUM, LLC | 624H | 125 | 1.9% |
| IP HORIZON LLC | 515J | 106 | 1.6% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 96 | 1.4% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 94 | 1.4% |
| COMMIO, LLC | 939H | 80 | 1.2% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 69 | 1.0% |
| TELNYX LLC | 073H | 68 | 1.0% |
| TERRA NOVA TELECOM INC. | 145J | 68 | 1.0% |
| AT&T CORP. | 516C | 51 | 0.8% |
| FRONTIER CALIFORNIA INC. | 4420 | 51 | 0.8% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 38 | 0.6% |
| FRONTIER CALIFORNIA INC. | 2319 | 34 | 0.5% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 32 | 0.5% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 20 | 0.3% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 19 | 0.3% |
60 rate centres. search them all.