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: BKFDCAKTX9X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-640 A Bakersfield: North DA CA 321J HD CARRIER LLC 734   2024-09-02   
661-640 8 Bakersfield: North DA CA 321J HD CARRIER LLC 734   2024-09-02   
661-640 9 Bakersfield: North DA CA 321J HD CARRIER LLC 734   2024-09-02   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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