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: 373

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-373 A Placentia CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
657-373 0 Placentia CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2019-05-10   
657-373 1 Placentia CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2019-05-10   
657-373 2 Placentia CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2019-05-10   
657-373 3 Placentia CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2019-05-10   
657-373 4 Placentia CA TRNECAGB7MD  899D METROPCS NETWORKS, LLC 730   2020-06-15   
657-373 6 Placentia CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2020-05-14   
657-373 7 Placentia CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2019-09-23   
657-373 8 Placentia CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2019-09-23   
657-373 9 Placentia CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2019-07-18   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.