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:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-287 A Claremont NH MNCHNHNIDS0  4017 LEVEL 3 COMMUNICATIONS - NH 122      
603-287 1 Claremont NH   4017 LEVEL 3 COMMUNICATIONS - NH 122   2005-09-10   
603-287 2 Claremont NH   7421 AT&T LOCAL 122   2010-02-22   
603-287 4 Claremont NH   4017 LEVEL 3 COMMUNICATIONS - NH 122      
603-287 5 Claremont NH   9247 BROADVIEW NETWORKS, INC. - NH 122   2010-02-26   
603-287 7 Claremont NH   4112 COMCAST PHONE OF NEW HAMPSHIRE, LLC - NH 122   2015-09-14   
603-287 8 Claremont NH   4112 COMCAST PHONE OF NEW HAMPSHIRE, LLC - NH 122   2011-07-18   
603-287 9 Claremont NH   8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2019-05-17   

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.