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: 576

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-576 A Manassas VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-576 0 Manassas VA   939H COMMIO, LLC 236   2021-10-03   
571-576 1 Manassas VA   939H COMMIO, LLC 236   2021-10-03   
571-576 2 Manassas VA   138E ONVOY, LLC - VA 236   2021-10-02   
571-576 3 Manassas VA   138E ONVOY, LLC - VA 236   2021-10-02   
571-576 4 Manassas VA   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2021-12-01   
571-576 5 Manassas VA   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2021-12-01   
571-576 6 Manassas VA   138E ONVOY, LLC - VA 236   2024-02-16   
571-576 7 Manassas VA   138E ONVOY, LLC - VA 236   2021-11-18   
571-576 8 Manassas VA   939H COMMIO, LLC 236   2021-10-03   
571-576 9 Manassas VA   939H COMMIO, LLC 236   2021-10-03   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.