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: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 424

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-424 A Pond MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-05-20   
636-424 0 Pond MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-05-20   
636-424 1 Pond MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-01-11   
636-424 4 Pond MO   145J TERRA NOVA TELECOM INC. 520   2025-04-09   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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