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: PHLAPAMKXHX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
302-551 A Wilmington DE 478J NUSO, LLC 228      
302-551 1 Wilmington DE 478J NUSO, LLC 228   2020-10-27   
445-202 A Philadelphia Zone 1 PA 478J NUSO, LLC 228      
445-202 1 Philadelphia Zone 1 PA 478J NUSO, LLC 228   2020-11-08   
445-286 7 Philadelphia Zone 1 PA 478J NUSO, LLC 228   2023-12-19   
445-286 8 Philadelphia Zone 1 PA 478J NUSO, LLC 228   2023-12-19   
484-202 5 Chester Springs PA 478J NUSO, LLC 228   2023-12-10   
484-617 A Chester Springs PA 478J NUSO, LLC 228      
484-617 1 Chester Springs PA 478J NUSO, LLC 228   2021-01-24   
484-617 5 Chester Springs PA 478J NUSO, LLC 228   2023-12-10   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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