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: 237

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-237 A Charlevoix MI CHVXMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-237 0 Charlevoix MI CHVXMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-237 1 Charlevoix MI CHVXMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-237 2 Charlevoix MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2012-06-01   
231-237 3 Charlevoix MI GDRPMIBLXTZ  3535 ACD TELECOM, INC. - MI 348   2004-10-23   
231-237 4 Charlevoix MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348   2004-11-18   
231-237 5 Charlevoix MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348   2007-03-09   
231-237 6 Charlevoix MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348   2015-09-16   
231-237 7 Charlevoix MI BRSPMI09DS0  933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 348   2015-12-21   
231-237 8 Charlevoix MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348   2018-06-21   
231-237 9 Charlevoix MI CHVXMIMNRS0  9323 MICHIGAN BELL TEL CO 348      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.