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: 731

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-731 A Castroville CA   515J IP HORIZON LLC 736      
831-731 0 Castroville CA SLNSCABIXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 736      
831-731 1 Castroville CA   515J IP HORIZON LLC 736      
831-731 2 Castroville CA   515J IP HORIZON LLC 736      
831-731 3 Castroville CA MTRYCAPM0MD  073H TELNYX LLC 736      
831-731 4 Castroville CA   515J IP HORIZON LLC 736      
831-731 5 Castroville CA SLNSCA01XXX  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 736      
831-731 6 Castroville CA SLNSCA01X1Y  7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 736      
831-731 7 Castroville CA   515J IP HORIZON LLC 736      
831-731 8 Castroville CA SLNSCA01X9Y  649C ONVOY, LLC - CA 736      
831-731 9 Castroville CA   515J IP HORIZON LLC 736      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.