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: 271

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-271 A Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730      
657-271 0 Westminster CA ANHMCANG2MD  4733 PAETEC COMMUNICATIONS, INC. - CA 730   2015-07-21   
657-271 1 Westminster CA   515J IP HORIZON LLC 730   2015-09-19   
657-271 2 Westminster CA LNBHCAXPXBY  649C ONVOY, LLC - CA 730   2015-08-17   
657-271 3 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-09-17   
657-271 4 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-09-17   
657-271 5 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-07-04   
657-271 6 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-07-04   
657-271 7 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-07-04   
657-271 8 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-07-04   
657-271 9 Westminster CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2015-07-04   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.