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: 224

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-224 A Fremont MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348      
231-224 0 Fremont MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-224 2 Fremont MI   145J TERRA NOVA TELECOM INC. 348      
231-224 3 Fremont MI GDRPMIBLXDZ  2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 348      
231-224 4 Fremont MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-224 5 Fremont MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-224 6 Fremont MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348      
231-224 7 Fremont MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348      
231-224 8 Fremont MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-224 9 Fremont MI BRSPMI09DS0  933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 348      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.