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: 810

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-810 A Nashua NH MNCHNHAC4MD  073H TELNYX LLC 122      
603-810 0 Nashua NH MNCHNHAC4MD  073H TELNYX LLC 122   2021-07-23   
603-810 1 Nashua NH MNCHNHBODS0  927H PEERLESS NETWORK OF NEW HAMPSHIRE, LLC - NH 122   2021-07-24   
603-810 2 Nashua NH MNCHNHAC3MD  939H COMMIO, LLC 122   2021-08-29   
603-810 3 Nashua NH MNCHNHAC3MD  939H COMMIO, LLC 122   2021-08-29   
603-810 4 Nashua NH MNCHNHAC3MD  939H COMMIO, LLC 122   2021-08-29   
603-810 5 Nashua NH MNCHNHAC3MD  939H COMMIO, LLC 122   2021-08-29   
603-810 6 Nashua NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2021-08-02   
603-810 7 Nashua NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2021-08-02   
603-810 8 Nashua NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2021-08-02   
603-810 9 Nashua NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2021-08-10   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.