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: 237

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-237 A Soledad CA   515J IP HORIZON LLC 736      
831-237 0 Soledad CA   981E BANDWIDTH.COM CLEC, LLC - CA 736   2015-11-07   
831-237 1 Soledad CA   515J IP HORIZON LLC 736      
831-237 2 Soledad CA   515J IP HORIZON LLC 736      
831-237 3 Soledad CA   7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 736   2015-04-15   
831-237 4 Soledad CA   508J CENTURYLINK COMMUNICATIONS, LLC 736   2015-11-09   
831-237 5 Soledad CA   516C AT&T CORP. 736   2011-06-20   
831-237 6 Soledad CA   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 736   2013-07-08   
831-237 7 Soledad CA   981E BANDWIDTH.COM CLEC, LLC - CA 736   2014-08-17   
831-237 8 Soledad CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 736   2012-03-10   
831-237 9 Soledad CA   5562 METROPCS, INC. 736   2013-08-01   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.