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: 590

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-590 A Trumbull CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-590 0 Trumbull CT BLFDCTAP2MD  6664 SPRINT SPECTRUM, L.P. 920   2011-12-19   
203-590 1 Trumbull CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2012-05-17   
203-590 2 Trumbull CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-02-08   
203-590 3 Trumbull CT WLMNCT131MD  777C CHARTER FIBERLINK CT-CCO, LLC - CT 920   2013-03-29   
203-590 4 Trumbull CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2011-11-26   
203-590 5 Trumbull CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-10-30   
203-590 6 Trumbull CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2012-03-03   
203-590 7 Trumbull CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2011-05-27   
203-590 8 Trumbull CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-04-29   
203-590 9 Trumbull CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-04-29   

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.