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: 400

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-400 A Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2024-01-23   
657-400 0 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730      
657-400 1 Westminster CA ANHMCANG2MD  4733 PAETEC COMMUNICATIONS, INC. - CA 730      
657-400 2 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
657-400 3 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
657-400 4 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730      
657-400 5 Westminster CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
657-400 6 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730      
657-400 7 Westminster CA LSANCAJW2MD  508J CENTURYLINK COMMUNICATIONS, LLC 730      
657-400 8 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730      
657-400 9 Westminster CA LNBHCAXPXWX  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.