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: 517

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-517 A Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 0 Dulles VA WASHDC127MD  073H TELNYX LLC 236      
571-517 1 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 2 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 4 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 5 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 6 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 7 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 8 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      
571-517 9 Dulles VA VINNVACBDS0  138E ONVOY, LLC - VA 236      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.