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: 831 [Rate centres in NPA 831] [Dial plan for NPA 831]

NXX: 350

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-350 A Tres Pinos CA SLNSCA01XXX  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 736      
831-350 0 Tres Pinos CA MTRYCA012MD  981E BANDWIDTH.COM CLEC, LLC - CA 736   2010-08-30   
831-350 1 Tres Pinos CA MTRYCA012MD  981E BANDWIDTH.COM CLEC, LLC - CA 736   2010-09-27   
831-350 3 Tres Pinos CA MTRYCA012MD  981E BANDWIDTH.COM CLEC, LLC - CA 736   2015-05-03   
831-350 4 Tres Pinos CA SLNSCA01XXX  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 736   2006-07-02   
831-350 5 Tres Pinos CA SLNSCA01X9Y  649C ONVOY, LLC - CA 736   2021-07-30   
831-350 6 Tres Pinos CA SLNSCA01XXX  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 736   2007-10-18   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.