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: 408

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-408 A Berlin NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-408 0 Berlin NH MNCHNHCO23Z  073H TELNYX LLC 122   2024-06-30   
603-408 2 Berlin NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122   2020-03-24   
603-408 3 Berlin NH   5562 METROPCS, INC. 122   2025-04-11   
603-408 4 Berlin NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2025-06-02   
603-408 6 Berlin NH DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2019-05-17   
603-408 7 Berlin NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2025-03-14   
603-408 8 Berlin NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2016-01-23   
603-408 9 Berlin NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2016-01-23   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.