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: 417 [Rate centres in NPA 417] [Dial plan for NPA 417]

NXX: 643

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
417-643 A West Plains MO   6275 UNITED STATES CELLULAR - MO 522   2025-05-17  2025-11-21 

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

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