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.

Switch: SNBRTNXARS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-628 A Sunbright TN 0565 HIGHLAND TEL. COOP, INC. 474      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.