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.

OCN: 4793 XO ARIZONA, INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
520-437 A Tucson AZ TCSNAZMAGT0  668      
520-437 0 Tucson AZ TCSNAZMAGT0  668   2006-05-21   
623-398 A Phoenix AZ PHNAAZ55DS1  666      
623-398 0 Phoenix AZ PHNAAZ55DS1  666      
623-398 3 Phoenix AZ PHNAAZ55DS1  666      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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