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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NPA: 650 [Rate centres in NPA 650] [Dial plan for NPA 650]

NXX: 990

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-990 A South San Francisco CA   649C ONVOY, LLC - CA 722   2026-07-23   
650-990 0 South San Francisco CA   649C ONVOY, LLC - CA 722   2026-07-23   
650-990 1 South San Francisco CA   649C ONVOY, LLC - CA 722   2026-07-23   
650-990 2 South San Francisco CA   649C ONVOY, LLC - CA 722   2026-07-23   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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