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: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 571

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-571 A Westport CT NWHNCT02X5X  7421 AT&T - LOCAL 920      
203-571 0 Westport CT SMFRCTQI9MD  3493 GLOBAL CROSSING LOCAL SERVICES, INC. - CT 920   2001-05-07   
203-571 1 Westport CT NWHNCT030MD  3722 CONVERSENT COMMUNICATIONS OF CONNECTICUT, LLC - CT 920   2001-05-17   
203-571 2 Westport CT MDTWCTNIGT1  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2016-01-19   
203-571 3 Westport CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-05-02   
203-571 4 Westport CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-05-02   
203-571 5 Westport CT NWHNCT02X5X  7421 AT&T - LOCAL 920      
203-571 6 Westport CT NWHNCT030MD  3722 CONVERSENT COMMUNICATIONS OF CONNECTICUT, LLC - CT 920   2006-05-25   
203-571 7 Westport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2005-11-28   
203-571 8 Westport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2002-12-11   
203-571 9 Westport CT MDTWCTNIGT1  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2016-01-19   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.