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: 756

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-756 A Haymarket VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2026-06-15   
571-756 0 Haymarket VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2026-06-15   
571-756 1 Haymarket VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2026-06-15   
571-756 6 Haymarket VA WASHDC127MD  073H TELNYX LLC 236   2026-07-27   
571-756 7 Haymarket VA   114J EXIANT COMMUNICATIONS LLC 236   2026-09-25   
571-756 8 Haymarket VA   138E ONVOY, LLC - VA 236   2026-09-18   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.