California
Area codes
3
Rate centres
61
Carriers
51
Prefix blocks
7,282
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.
51 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | 649C | 1,320 | 18.1% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1,246 | 17.1% |
| PACIFIC BELL | 9740 | 746 | 10.2% |
| T-MOBILE USA, INC. | 6529 | 708 | 9.7% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 583 | 8.0% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 472 | 6.5% |
| METROPCS, INC. | 5562 | 428 | 5.9% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 234 | 3.2% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 195 | 2.7% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 163 | 2.2% |
| ONVOY SPECTRUM, LLC | 624H | 152 | 2.1% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 134 | 1.8% |
| IP HORIZON LLC | 515J | 120 | 1.6% |
| TELNYX LLC | 073H | 97 | 1.3% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 92 | 1.3% |
| COMMIO, LLC | 939H | 85 | 1.2% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 67 | 0.9% |
| AT&T CORP. | 516C | 66 | 0.9% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | 54 | 0.7% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 52 | 0.7% |
| TERRA NOVA TELECOM INC. | 145J | 40 | 0.5% |
| FRONTIER CALIFORNIA INC. | 4420 | 27 | 0.4% |
| HD CARRIER LLC | 321J | 24 | 0.3% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 18 | 0.2% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 18 | 0.2% |
61 rate centres. search them all.