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: 921

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-921 A Hayward CA SNFCCAFJDS0  7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 722      
510-921 0 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 1 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 2 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 3 Hayward CA SNFCCAFJDS0  7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 722      
510-921 4 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 5 Hayward CA SNFCCAFJDS0  7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 722      
510-921 6 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 7 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      
510-921 8 Hayward CA   5562 METROPCS, INC. 722      
510-921 9 Hayward CA OKLECAZVGT0  5562 METROPCS, INC. 722      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.