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: 588

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-588 A Ellsworth MI ELWOMIXHRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-588 0 Ellsworth MI GDRPMIBLXTZ  3535 ACD TELECOM, INC. - MI 348   2004-10-22   
231-588 1 Ellsworth MI   792K CHARTER IP ENABLED SERVICES, LLC 348   2008-08-27   
231-588 2 Ellsworth MI ELWOMIXHRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-588 3 Ellsworth MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348   2012-07-09   
231-588 5 Ellsworth MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-07-11   
231-588 6 Ellsworth MI ELWOMIXHRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-588 7 Ellsworth MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2013-04-01   
231-588 8 Ellsworth MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-06-17   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.