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: 475 [Rate centres in NPA 475] [Dial plan for NPA 475]

NXX: 371

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-371 A New Canaan CT HRFRCT0389Z  490J DISH WIRELESS, LLC 920   2024-07-21   
475-371 0 New Canaan CT HRFRCT0389Z  490J DISH WIRELESS, LLC 920   2024-07-21   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.