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: 971

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-971 A Rindge NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-971 0 Rindge NH MNCHNHCO42Z  793K TWC IP ENABLED SERVICES, LLC 122   2024-01-07   
603-971 1 Rindge NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-971 2 Rindge NH   145J TERRA NOVA TELECOM INC. 122   2023-11-11   
603-971 3 Rindge NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-971 4 Rindge NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-971 6 Rindge NH DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2019-05-16   
603-971 9 Rindge NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.