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: 600

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-600 A Dulles Metro VA WASHDC12KMD  145J TERRA NOVA TELECOM INC. 236      
571-600 1 Dulles Metro VA ARTNVAARDS2  275G PEERLESS NETWORK OF VIRGINIA, LLC - VA 236   2019-06-27   
571-600 2 Dulles Metro VA WASHDC127MD  073H TELNYX LLC 236   2019-10-12   
571-600 3 Dulles Metro VA ARTNVAARDS2  275G PEERLESS NETWORK OF VIRGINIA, LLC - VA 236   2020-03-04   
571-600 4 Dulles Metro VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2020-11-09   
571-600 5 Dulles Metro VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2020-07-04   
571-600 6 Dulles Metro VA VINNVACBDS0  138E ONVOY, LLC - VA 236   2020-07-04   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.