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: 501

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-501 A Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 0 Portsmouth NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2006-06-04   
603-501 1 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122   2007-12-28   
603-501 2 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 3 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 4 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 5 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 6 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 7 Portsmouth NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122      
603-501 8 Portsmouth NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2006-10-02   
603-501 9 Portsmouth NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2006-05-16   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.