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: 401 [Rate centres in NPA 401] [Dial plan for NPA 401]

NXX: 310

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
401-310 A Warren RI EPRVRINB9MD  003F BANDWIDTH.COM CLEC, LLC - RI 130      
401-310 0 Warren RI   003F BANDWIDTH.COM CLEC, LLC - RI 130   2010-11-28   
401-310 1 Warren RI   939H COMMIO, LLC 130   2023-11-04   
401-310 2 Warren RI   977E ONVOY, LLC - RI 130   2024-01-13   
401-310 3 Warren RI   977E ONVOY, LLC - RI 130   2024-01-13   
401-310 8 Warren RI   939H COMMIO, LLC 130   2023-11-04   
401-310 9 Warren RI   939H COMMIO, LLC 130   2023-11-04   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.