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: GNBONCPHX9X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
743-257 A Winston-Salem NC 732J NUSO, LLC 424      
743-257 1 Winston-Salem NC 732J NUSO, LLC 424   2023-04-15   

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

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