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]


NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-813 A Center Barnstead NH ROCHNHEBPS0  314C IDT AMERICA CORP - NH 122   2009-12-18   
603-813 2 Center Barnstead NH   314C IDT AMERICA CORP - NH 122   2009-12-18   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.