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: 592

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-592 A Spofford NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      
603-592 1 Spofford NH MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122   2024-12-28   
603-592 4 Spofford NH PTMONH073MD  9827 OTEL TELEKOM, INC. - NH 122   2002-09-19   
603-592 5 Spofford NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-08-29   
603-592 6 Spofford NH MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122   2024-02-02   
603-592 9 Spofford NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.