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: 483

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-483 A Candia NH CANDNHDERS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 0 Candia NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 1 Candia NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 2 Candia NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 3 Candia NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2004-09-03   
603-483 4 Candia NH   145J TERRA NOVA TELECOM INC. 122   2026-01-10   
603-483 5 Candia NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 6 Candia NH   8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2002-11-15   
603-483 7 Candia NH   8468 FREEDOM RING COMMUNICATIONS, LLC 122   2013-02-15   
603-483 8 Candia NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-483 9 Candia NH   6386 BELL ATLANTIC MOBILE, INC 122   2019-01-07   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.