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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-279 A Salinas CA 490J DISH WIRELESS, LLC 736      
831-279 9 Salinas CA 490J DISH WIRELESS, LLC 736   2023-07-13   
831-324 7 Monterey CA 490J DISH WIRELESS, LLC 736   2023-11-08   
831-833 2 Hollister CA 490J DISH WIRELESS, LLC 736   2023-12-10   

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

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