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
571-444 0 Washington Zone 8 VA VINNVACB1MD  236   2015-12-25   
571-474 0 Washington Zone 19 VA VINNVACB1MD  236   2015-12-25   

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

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