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: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 523

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-523 A Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   
667-523 5 Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   
667-523 6 Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   
667-523 7 Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   
667-523 8 Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   
667-523 9 Odenton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2025-09-29   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.