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: 423

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-423 A Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 0 Washington Zone 17 VA MCLNVA23DS4  8825 LEVEL 3 COMMUNICATIONS, LLC - VA 236   2012-04-28   
571-423 1 Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 2 Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 3 Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 4 Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 5 Washington Zone 17 VA FLCHVAMFDS0  9213 VERIZON VIRGINIA, INC. 236      
571-423 6 Washington Zone 17 VA WASKDCFNAMD  6827 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 236   2012-12-23   
571-423 7 Washington Zone 17 VA BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2011-11-30   
571-423 8 Washington Zone 17 VA BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-06-08   
571-423 9 Washington Zone 17 VA BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-06-08   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.