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: 660

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-660 A Byram CT   350E YMAX COMMUNICATIONS CORP. - CT 132      
203-660 0 Byram CT WHPLNYWPXOY  199F BANDWIDTH.COM CLEC, LLC - CT 132   2010-08-07   
203-660 1 Byram CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2008-06-01   
203-660 2 Byram CT   145J TERRA NOVA TELECOM INC. 132   2022-04-17   
203-660 3 Byram CT NYCMNYBXDSL  639C ONVOY, LLC - CT 132   2021-03-04   
203-660 4 Byram CT NYCMNY37TMD  624H ONVOY SPECTRUM, LLC 132   2024-10-22   
203-660 5 Byram CT NYCMNY37TMD  624H ONVOY SPECTRUM, LLC 132   2024-10-22   
203-660 6 Byram CT WHPLNYYFDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 132   2003-06-08   
203-660 7 Byram CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2008-04-21   
203-660 8 Byram CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2008-06-01   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.