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.
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Switch: KNWCWAXAX1X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
509-231 0 Kennewick WA 624H ONVOY SPECTRUM, LLC 676   2024-06-18   
509-518 A Kennewick WA 624H ONVOY SPECTRUM, LLC 676      
509-518 1 Kennewick WA 624H ONVOY SPECTRUM, LLC 676   2022-03-26   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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