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: 587

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-587 A Georgetown CT NRWLCT02SMD  4950 CABLEVISION LIGHTPATH, INC. - CT 920      
203-587 0 Georgetown CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2010-03-21   
203-587 1 Georgetown CT NRWLCT02SMD  4950 CABLEVISION LIGHTPATH, INC. - CT 920      
203-587 2 Georgetown CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-08   
203-587 3 Georgetown CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2022-10-27   
203-587 4 Georgetown CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-05-03   
203-587 5 Georgetown CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-08   
203-587 6 Georgetown CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-08   
203-587 7 Georgetown CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-06-15   
203-587 8 Georgetown CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-05-03   
203-587 9 Georgetown CT NRWLCT02SMD  4950 CABLEVISION LIGHTPATH, INC. - CT 920      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.