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: ARTNVACKDS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
703-310 A Washington Zone 8 VA 7421 AT&T - LOCAL 236      
703-310 3 Washington Zone 8 VA 7421 AT&T - LOCAL 236      
703-336 A Washington Zone 17 VA 7421 AT&T - LOCAL 236      
703-376 9 Herndon VA 7421 AT&T - LOCAL 236      

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

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