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: 510 [Rate centres in NPA 510] [Dial plan for NPA 510]

NXX: 574

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-574 A Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 0 Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 1 Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 2 Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 3 Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 4 Fremont-Newark: Main DA CA FRMTCA11DS0  9740 PACIFIC BELL 722      
510-574 5 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2010-07-11   
510-574 6 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2009-12-04   
510-574 7 Fremont-Newark: Main DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2009-12-17   
510-574 8 Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2010-03-19   
510-574 9 Fremont-Newark: Main DA CA SNFCCAMMDS7  258E YMAX COMMUNICATIONS CORP. - CA 722   2010-04-27   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.