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: GNBONCEU78Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
336-743 A Greensboro NC 624H ONVOY SPECTRUM, LLC 424   2024-05-15   
743-225 A Julian NC 624H ONVOY SPECTRUM, LLC 424      
743-231 A Madison NC 624H ONVOY SPECTRUM, LLC 424      
743-237 A Quaker Gap NC 624H ONVOY SPECTRUM, LLC 424      
743-296 A Reidsville NC 624H ONVOY SPECTRUM, LLC 424      
743-343 A Lewisville NC 624H ONVOY SPECTRUM, LLC 424   2024-11-03   
743-369 A Sandy Ridge NC 624H ONVOY SPECTRUM, LLC 424      
743-902 A Greensboro NC 624H ONVOY SPECTRUM, LLC 424      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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