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: ELKNNCXAX5X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
336-910 A Elkin NC 638E ONVOY, LLC - NC 424      
743-393 A West Jefferson NC 638E ONVOY, LLC - NC 424   2024-01-15   
743-437 A Dobson NC 638E ONVOY, LLC - NC 424      
743-740 A Mount Airy NC 638E ONVOY, LLC - NC 424      
743-800 A Roaring Gap NC 638E ONVOY, LLC - NC 424   2024-01-15   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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