Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 310 [Rate centres in NPA 310] [Dial plan for NPA 310]

NXX: 510

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
310-510 A Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 0 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 1 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 2 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 3 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 4 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 5 Avalon CA LSANCAGJDS4  7453 US TELEPACIFIC CORP. - CA 730   2011-04-22   
310-510 6 Avalon CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2002-05-13   
310-510 7 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 8 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      
310-510 9 Avalon CA AVLNCA11RS0  9740 PACIFIC BELL 730      

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.