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: AGFIAZSRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
623-232 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-232 4 Phoenix AZ 9636 QWEST CORPORATION 666   2016-11-18   
623-362 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-376 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 0 Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 1 Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 2 Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 3 Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 4 Phoenix AZ 9636 QWEST CORPORATION 666      
623-537 6 Phoenix AZ 9636 QWEST CORPORATION 666      
623-561 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-566 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-572 A Phoenix AZ 9636 QWEST CORPORATION 666      
623-806 7 Phoenix AZ 9636 QWEST CORPORATION 666   2010-02-26   
623-825 A Phoenix AZ 9636 QWEST CORPORATION 666      

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

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