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: 633

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-633 A Milford NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122      
603-633 0 Milford NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2022-06-20   
603-633 1 Milford NH MNCHNHCO23Z  073H TELNYX LLC 122   2022-10-06   
603-633 2 Milford NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2023-04-06   
603-633 3 Milford NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2023-08-20   
603-633 4 Milford NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2022-09-29   
603-633 5 Milford NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2022-09-29   
603-633 6 Milford NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2023-02-17   
603-633 7 Milford NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2023-02-17   
603-633 8 Milford NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2022-11-26   
603-633 9 Milford NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2023-02-17   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.