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: 588

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-588 A Brea CA LSANCAJWIMD  965H FRACTEL, LLC 730      
657-588 0 Brea CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
657-588 1 Brea CA LSANCA03GMD  624H ONVOY SPECTRUM, LLC 730   2021-05-22   
657-588 2 Brea CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2024-07-09   
657-588 3 Brea CA LSANCAJW5MD  197D VONAGE AMERICA LLC 730   2020-07-28   
657-588 4 Brea CA LSANCA03GMD  624H ONVOY SPECTRUM, LLC 730   2021-05-22   
657-588 5 Brea CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-07-29   
657-588 6 Brea CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-07-29   
657-588 7 Brea CA LSANCAJW5MD  197D VONAGE AMERICA LLC 730   2020-07-28   
657-588 8 Brea CA LSANCAJWIMD  965H FRACTEL, LLC 730   2020-07-27   
657-588 9 Brea CA LSANCA03GMD  624H ONVOY SPECTRUM, LLC 730   2021-05-22   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.