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: PHLAPAMKGMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
267-457 A Philadelphia Zone 1 PA 551G NUSO, LLC 228      
484-473 A West Chester PA 551G NUSO, LLC 228      
484-510 A Bethlehem PA 551G NUSO, LLC 228      
610-936 A Bethlehem PA 551G NUSO, LLC 228      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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