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: 363

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-363 A Westport CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-04-22   
475-363 0 Westport CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-04-22   
475-363 1 Westport CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2025-02-19   
475-363 2 Westport CT HRFRCTCR3MD  318J COMCAST IP PHONE, LLC 920   2024-11-01   
475-363 3 Westport CT HRFRCT03XMX  145J TERRA NOVA TELECOM INC. 920   2024-04-23   
475-363 8 Westport CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2025-02-19   
475-363 9 Westport CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2024-09-21   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.