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
603-556 A Laconia NH MNCHNHNIDS0  4017 LEVEL 3 COMMUNICATIONS - NH 122      
603-556 0 Laconia NH   6664 SPRINT SPECTRUM L.P. 122   2003-06-04   
603-556 1 Laconia NH   6664 SPRINT SPECTRUM L.P. 122   2003-06-04   
603-556 2 Laconia NH   6664 SPRINT SPECTRUM L.P. 122   2003-06-04   
603-556 3 Laconia NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2020-03-17   
603-556 4 Laconia NH   4017 LEVEL 3 COMMUNICATIONS - NH 122      
603-556 5 Laconia NH   651D CRC COMMUNICATIONS OF MAINE, INC. - NH 122   2011-03-21   
603-556 6 Laconia NH   7421 AT&T LOCAL 122   2003-11-28   
603-556 7 Laconia NH   4017 LEVEL 3 COMMUNICATIONS - NH 122   2005-07-15   
603-556 8 Laconia NH   4017 LEVEL 3 COMMUNICATIONS - NH 122   2005-07-15   
603-556 9 Laconia NH   314C IDT AMERICA CORP - NH 122   2010-08-08   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.