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.

Switch: OLVEMOAX0MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-821 3 Pond MO 792K CHARTER IP ENABLED SERVICES, LLC 520   2006-04-16   
636-900 9 Washington MO 792K CHARTER IP ENABLED SERVICES, LLC 520   2015-12-15   

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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