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: PHNXAZMRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
623-523 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-523 0 Phoenix AZ 9636 QWEST CORPORATION 666      
623-523 5 Phoenix AZ 9636 QWEST CORPORATION 666      
623-523 6 Phoenix AZ 9636 QWEST CORPORATION 666      
623-523 8 Phoenix AZ 9636 QWEST CORPORATION 666      
623-583 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-815 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-824 0 Phoenix AZ 9636 QWEST CORPORATION 666   2006-07-07   
623-832 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-875 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-876 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-933 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-972 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-974 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-977 A Phoenix AZ 9636 QWEST CORPORATION 666      

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

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