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: 741

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-741 A New Boston NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122      
603-741 0 New Boston NH MNCHNHCOXCZ  996E BANDWIDTH.COM CLEC, LLC - NH 122      
603-741 3 New Boston NH MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122      
603-741 5 New Boston NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122      
603-741 7 New Boston NH DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122      
603-741 8 New Boston NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122      
603-741 9 New Boston NH MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.