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: 689

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-689 A Guilford CT CHSHCT02DS0  7421 AT&T LOCAL 920      
203-689 0 Guilford CT   539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-05-03   
203-689 1 Guilford CT   3863 CTC COMMUNICATIONS CORP. - CT 920   2006-02-02   
203-689 2 Guilford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-02-08   
203-689 3 Guilford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2015-05-10   
203-689 4 Guilford CT   9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-07-24   
203-689 5 Guilford CT   318J COMCAST IP PHONE LLC 920   2009-08-23   
203-689 6 Guilford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-06-30   
203-689 7 Guilford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-06-30   
203-689 8 Guilford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2015-05-10   
203-689 9 Guilford CT   7421 AT&T LOCAL 920      

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.