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: 850

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-850 A Leesburg VA   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 246   2026-04-16   
571-850 0 Leesburg VA   138E ONVOY, LLC - VA 246   2026-04-17   
571-850 8 Leesburg VA   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 246   2026-04-16   
571-850 9 Leesburg VA   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 246   2026-04-16   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.