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: 490

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-490 A Naugatuck CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-490 0 Naugatuck CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2005-01-17   
203-490 1 Naugatuck CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-490 2 Naugatuck CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2005-02-07   
203-490 3 Naugatuck CT HRFRCTASDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 920   2007-04-15   
203-490 4 Naugatuck CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2003-08-12   
203-490 5 Naugatuck CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2009-09-10   
203-490 6 Naugatuck CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-09-09   
203-490 7 Naugatuck CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2005-12-29   
203-490 8 Naugatuck CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2004-04-09   
203-490 9 Naugatuck CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2002-12-11   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.