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: 633

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-633 A Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 0 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 1 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 2 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 3 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 4 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 5 Washington Zone 17 VA BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2011-11-30   
571-633 6 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 7 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 8 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      
571-633 9 Washington Zone 17 VA MCLNVALVDS0  9213 VERIZON VIRGINIA, INC. 236      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.