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

NXX: 358

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-358 A Branford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-04-06   
475-358 0 Branford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-04-06   
475-358 1 Branford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-04-06   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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