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: 285

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-285 A Dover NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      
603-285 0 Dover NH MNCHNHCOX9Y  4286 LIGHTSHIP TELECOM, LLC - NH 122   2001-03-26   
603-285 1 Dover NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2007-03-29   
603-285 2 Dover NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2007-03-29   
603-285 3 Dover NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2007-03-29   
603-285 4 Dover NH MNCHNHCOX1Y  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2004-04-11   
603-285 5 Dover NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2005-07-08   
603-285 6 Dover NH MNCHNHCOXMX  4206 PAETEC COMMUNICATIONS, INC. - NH 122   2012-08-27   
603-285 7 Dover NH MNCHNHCOXAZ  4206 PAETEC COMMUNICATIONS, INC. - NH 122   2014-08-29   
603-285 8 Dover NH MNCHNHNI9MD  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2016-12-10   
603-285 9 Dover NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.