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: 621

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-621 A Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
571-621 0 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2019-11-29   
571-621 1 Manassas VA MCLNVA23DS4  8825 LEVEL 3 COMMUNICATIONS, LLC - VA 236   2020-08-27   
571-621 2 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2020-02-24   
571-621 3 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2020-02-24   
571-621 4 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2020-02-24   
571-621 5 Manassas VA VINNVACBDS0  138E ONVOY, LLC VA 236   2019-12-15   
571-621 6 Manassas VA VINNVACBDS0  138E ONVOY, LLC VA 236   2020-01-18   
571-621 7 Manassas VA VINNVACBDS0  138E ONVOY, LLC VA 236   2020-01-18   
571-621 8 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2019-10-12   
571-621 9 Manassas VA BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2019-10-11   

Last updated: Tue, 04 May 2021 15:04:27 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.