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: PHNXAZMAX8Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
480-996 0 Phoenix AZ 732J NUSO, LLC 666   2024-04-29   
602-399 8 Phoenix AZ 732J NUSO, LLC 666   2024-08-16   
623-291 A Phoenix AZ 732J NUSO, LLC 666      
623-291 1 Phoenix AZ 732J NUSO, LLC 666   2022-11-21   
623-309 5 Phoenix AZ 732J NUSO, LLC 666   2023-11-30   

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

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