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: 423

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
401-423 A Jamestown RI JMTWRINARS1  9102 VERIZON NEW ENGLAND INC. 130      
401-423 0 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      
401-423 1 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      
401-423 2 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      
401-423 3 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      
401-423 4 Jamestown RI   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 130   2013-11-15   
401-423 5 Jamestown RI   003F BANDWIDTH.COM CLEC, LLC - RI 130   2015-06-27   
401-423 6 Jamestown RI   516J TON80 COMMUNICATIONS, LLC 130   2021-10-23   
401-423 7 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      
401-423 9 Jamestown RI   9102 VERIZON NEW ENGLAND INC. 130      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.