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.

NPA: 571 [Rate centres in NPA 571] [Dial plan for NPA 571]

NXX: 670

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-670 A Washington Zone 8 VA ARTNVAARX5Y  939H COMMIO, LLC 236   2024-03-15   
571-670 0 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 1 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 2 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 3 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 4 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 5 Washington Zone 8 VA   939H COMMIO, LLC 236   2024-03-15   
571-670 6 Washington Zone 8 VA   138E ONVOY, LLC - VA 236   2024-03-16   
571-670 7 Washington Zone 8 VA   138E ONVOY, LLC - VA 236   2024-03-16   
571-670 8 Washington Zone 8 VA   138E ONVOY, LLC - VA 236   2024-03-16   
571-670 9 Washington Zone 8 VA   138E ONVOY, LLC - VA 236   2024-03-16   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.