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.

Switch: MTRYCAPM7MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-232 7 Chualar CA 516J TON80 COMMUNICATIONS, LLC 736   2022-03-21   
831-837 A Salinas CA 516J TON80 COMMUNICATIONS, LLC 736      
831-837 4 Salinas CA 516J TON80 COMMUNICATIONS, LLC 736   2022-03-11   
831-844 A Big Sur CA 516J TON80 COMMUNICATIONS, LLC 736      
831-844 6 Big Sur CA 516J TON80 COMMUNICATIONS, LLC 736   2021-06-27   
831-867 7 Monterey CA 516J TON80 COMMUNICATIONS, LLC 736   2022-03-17   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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