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: 381

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-381 A Wallingford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-12-05   
475-381 0 Wallingford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-12-05   
475-381 1 Wallingford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-12-15   
475-381 8 Wallingford CT   639C ONVOY, LLC - CT 920   2025-05-10   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.