California
Area codes
6
Rate centres
63
Carriers
66
Prefix blocks
10,771
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.
66 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | 649C | 1,479 | 13.7% |
| PACIFIC BELL | 9740 | 1,409 | 13.1% |
| T-MOBILE USA, INC. | 6529 | 1,063 | 9.9% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1,047 | 9.7% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 964 | 8.9% |
| METROPCS, INC. | 5562 | 805 | 7.5% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 694 | 6.4% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 394 | 3.7% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 305 | 2.8% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 224 | 2.1% |
| ONVOY SPECTRUM, LLC | 624H | 222 | 2.1% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 219 | 2.0% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 205 | 1.9% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 186 | 1.7% |
| IP HORIZON LLC | 515J | 172 | 1.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | 123 | 1.1% |
| CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY | 2334 | 111 | 1.0% |
| FIDIUM ENTERPRISE SERVICES, LLC | 3964 | 109 | 1.0% |
| COMMIO, LLC | 939H | 106 | 1.0% |
| FRACTEL, LLC | 965H | 94 | 0.9% |
| TELNYX LLC | 073H | 86 | 0.8% |
| CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | 75 | 0.7% |
| AT&T CORP. | 516C | 74 | 0.7% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 69 | 0.6% |
| ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7174 | 52 | 0.5% |
63 rate centres. search them all.