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: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 326

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-326 A Berlin NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122      
603-326 0 Berlin NH   829J PAETEC ITEL, LLC 122   2004-10-03   
603-326 1 Berlin NH   829J PAETEC ITEL, LLC 122   2004-08-12   
603-326 2 Berlin NH   9827 OTEL TELEKOM, INC. - NH 122   2002-09-10   
603-326 3 Berlin NH   145J TERRA NOVA TELECOM INC. 122   2024-04-24   
603-326 4 Berlin NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122      
603-326 5 Berlin NH   829J PAETEC ITEL, LLC 122   2003-09-09   
603-326 6 Berlin NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-07-01   
603-326 7 Berlin NH   829J PAETEC ITEL, LLC 122   2007-10-12   
603-326 8 Berlin NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2009-01-05   
603-326 9 Berlin NH   6290 UNITED STATES CELLULAR - NH 122   2007-03-14   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.