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: OLMSMIXIRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
231-223 A Old Mission MI 0720 ACE TEL. CO. OF MICHIGAN, INC. 348      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.