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: COVNCAXFX2Y

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
840-777 6 Pomona CA 624H ONVOY SPECTRUM, LLC 730   2021-07-22   
840-837 3 Pomona CA 624H ONVOY SPECTRUM, LLC 730   2022-03-12   
840-837 8 Pomona CA 624H ONVOY SPECTRUM, LLC 730   2022-03-12   
909-516 6 Chino CA 624H ONVOY SPECTRUM, LLC 730   2020-11-05   
909-526 3 Claremont-San Dimas CA 624H ONVOY SPECTRUM, LLC 730   2025-01-22   

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Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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