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: DTRTMITWDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-366 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   
313-368 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   
313-369 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   
313-891 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   
313-892 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   
313-893 A Detroit Zone 3 MI 9323 AMERITECH MICHIGAN 340   2004-07-31   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.