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: 388

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-388 A Stamford CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2025-03-24   
475-388 0 Stamford CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2025-03-25   
475-388 1 Stamford CT   639C ONVOY, LLC - CT 920   2025-05-10   
475-388 9 Stamford CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2025-03-24   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.