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: SLNSCA01XKY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-256 3 Salinas CA 506J TWILIO INTERNATIONAL, INC. 736   2015-07-13   
831-264 0 Monterey CA 506J TWILIO INTERNATIONAL, INC. 736      
831-264 1 Monterey CA 506J TWILIO INTERNATIONAL, INC. 736      
831-540 2 Salinas CA 506J TWILIO INTERNATIONAL, INC. 736      
831-717 A Monterey CA 506J TWILIO INTERNATIONAL, INC. 736      
831-717 9 Monterey CA 506J TWILIO INTERNATIONAL, INC. 736   2022-03-21   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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