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: 389

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-389 A Harrietta MI HRTAMIMNRSA  9323 MICHIGAN BELL TEL CO 348      
231-389 0 Harrietta MI HRTAMIMNRSA  9323 MICHIGAN BELL TEL CO 348      
231-389 1 Harrietta MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348   2004-11-12   
231-389 2 Harrietta MI HRTAMIMNRSA  9323 MICHIGAN BELL TEL CO 348      
231-389 3 Harrietta MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-07-11   
231-389 4 Harrietta MI GDRPMIBLXTZ  3535 ACD TELECOM, INC. - MI 348   2005-02-11   
231-389 5 Harrietta MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2012-06-01   
231-389 6 Harrietta MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2012-12-30   
231-389 7 Harrietta MI GDRPMIBL15Z  516C AT&T CORP. 348   2011-08-23   
231-389 8 Harrietta MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-04-25   
231-389 9 Harrietta MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2013-03-18   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.