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: 813

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-813 A Center Barnstead NH ROCHNHWE4MD  314C IDT AMERICA, CORP. - NH 122      
603-813 0 Center Barnstead NH MNCHNHAC3MD  939H COMMIO, LLC 122   2022-02-17   
603-813 1 Center Barnstead NH MNCHNHAC3MD  939H COMMIO, LLC 122   2022-02-17   
603-813 2 Center Barnstead NH ROCHNHWE4MD  314C IDT AMERICA, CORP. - NH 122   2009-12-18   
603-813 5 Center Barnstead NH MNCHNHBO2MD  490J DISH WIRELESS, LLC 122   2023-10-27   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.