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: 581

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
401-581 A Woonsocket RI WNSCRICLDS0  9102 VERIZON NEW ENGLAND INC. 130      
401-581 5 Woonsocket RI WNSCRICLDS0  9102 VERIZON NEW ENGLAND INC. 130      
401-581 6 Woonsocket RI PRVDRIWAVMD  7351 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 130   2023-07-28   
401-581 8 Woonsocket RI WNSCRICLDS0  9102 VERIZON NEW ENGLAND INC. 130      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.