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: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 644

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-644 A Cypress CA LSANCAJWIMD  965H FRACTEL, LLC 730      
657-644 0 Cypress CA LSANCARC32Z  073H TELNYX LLC 730   2021-02-26   
657-644 1 Cypress CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2021-04-22   
657-644 2 Cypress CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2021-06-21   
657-644 3 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
657-644 4 Cypress CA LSANCAJWIMD  965H FRACTEL, LLC 730   2020-11-15   
657-644 5 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-25   
657-644 6 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-25   
657-644 7 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-25   
657-644 8 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-25   
657-644 9 Cypress CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.