California
Area codes
2
Rate centres
13
Carriers
41
Prefix blocks
2,103
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.
41 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 366 | 17.4% |
| ONVOY, LLC - CA | 649C | 261 | 12.4% |
| T-MOBILE USA, INC. | 6529 | 237 | 11.3% |
| FRONTIER CALIFORNIA INC. | 2319 | 221 | 10.5% |
| METROPCS NETWORKS, LLC | 899D | 198 | 9.4% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 173 | 8.2% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 122 | 5.8% |
| TWC IP ENABLED SERVICES, LLC | 793K | 93 | 4.4% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 61 | 2.9% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 52 | 2.5% |
| ONVOY SPECTRUM, LLC | 624H | 43 | 2.0% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 32 | 1.5% |
| NUSO, LLC | 551G | 23 | 1.1% |
| COMMIO, LLC | 939H | 21 | 1.0% |
| FRACTEL, LLC | 965H | 21 | 1.0% |
| IP HORIZON LLC | 515J | 18 | 0.9% |
| TELNYX LLC | 073H | 18 | 0.9% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 15 | 0.7% |
| NUSO, LLC | 732J | 15 | 0.7% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 13 | 0.6% |
| YMAX COMMUNICATIONS CORP. - CA | 258E | 12 | 0.6% |
| TON80 COMMUNICATIONS, LLC | 516J | 10 | 0.5% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 10 | 0.5% |
| HD CARRIER LLC | 321J | 9 | 0.4% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 8 | 0.4% |
13 rate centres. search them all.