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: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
417-666 A Nevada MO   114J EXIANT COMMUNICATIONS LLC 522   2026-05-22   
417-666 6 Nevada MO   824J OPENTACT INC. 522   2026-05-25   
417-666 7 Nevada MO   114J EXIANT COMMUNICATIONS LLC 522   2026-05-22   

Last updated: Sun, 17 May 2026 03:26:51 UTC

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