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.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
480-903 A Phoenix AZ PHNXAZ19GMD  666      
480-903 9 Phoenix AZ PHNXAZ19GMD  666   2022-07-07   
571-903 A Washington Zone 8 VA   236   2026-03-15   
571-903 9 Washington Zone 8 VA   236   2026-03-15   

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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