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: 398

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-398 A Huntington CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2026-02-02   
475-398 0 Huntington CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2026-02-02   
475-398 5 Huntington CT HRFRCT0389Z  490J BOOST SUBSCRIBERCO L.L.C. 920   2026-09-24   
475-398 6 Huntington CT HRFRCT0389Z  490J BOOST SUBSCRIBERCO L.L.C. 920   2026-06-11   
475-398 8 Huntington CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2026-06-06   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.