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: 231 [Rate centres in NPA 231] [Dial plan for NPA 231]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-834 A Grant MI GRNTMIMNRSA  9323 AMERITECH MICHIGAN 348      
231-834 0 Grant MI   9323 AMERITECH MICHIGAN 348      
231-834 1 Grant MI   9323 AMERITECH MICHIGAN 348      
231-834 2 Grant MI   279B CLEAR RATE COMMUNICATIONS - CLEC - MI 348   2011-06-22   
231-834 4 Grant MI   543C ONVOY, LLC - MI 348   2016-03-21   
231-834 5 Grant MI   9323 AMERITECH MICHIGAN 348      
231-834 7 Grant MI   9323 AMERITECH MICHIGAN 348      
231-834 8 Grant MI   9323 AMERITECH MICHIGAN 348      
231-834 9 Grant MI   9323 AMERITECH MICHIGAN 348      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.