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: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-666 A Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2024-01-23   
657-666 0 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2010-12-31   
657-666 1 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2010-11-12   
657-666 2 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2011-08-20   
657-666 3 Westminster CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2010-11-27   
657-666 4 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2011-05-26   
657-666 5 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2011-05-26   
657-666 6 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2010-11-11   
657-666 7 Westminster CA ANHMCA01DS3  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730   2010-12-09   
657-666 8 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2013-09-22   
657-666 9 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2012-06-03   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.