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.

NPA: 350 [Rate centres in NPA 350] [Dial plan for NPA 350]

NXX: 263

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-263 A Modesto CA   649C ONVOY, LLC - CA 738   2026-10-12   
350-263 0 Modesto CA   649C ONVOY, LLC - CA 738   2026-10-12   
350-263 1 Modesto CA   649C ONVOY, LLC - CA 738   2026-10-12   
350-263 2 Modesto CA   649C ONVOY, LLC - CA 738   2026-10-12   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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