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: 637

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
401-637 A Westerly RI PRVDRIWAHMD  318J COMCAST IP PHONE, LLC 130      
401-637 0 Westerly RI PRVDRIWAXJY  977E ONVOY, LLC - RI 130   2023-08-09   
401-637 1 Westerly RI PRVDRIWAXJY  977E ONVOY, LLC - RI 130   2023-08-09   
401-637 4 Westerly RI PRVDRIWAHMD  318J COMCAST IP PHONE, LLC 130   2007-09-14   
401-637 7 Westerly RI PRVDRIWAHMD  318J COMCAST IP PHONE, LLC 130   2010-05-18   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.