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: 279

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-279 A Big Rapids MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348      
231-279 0 Big Rapids MI GDRPMIBL41Z  506J TWILIO INTERNATIONAL, INC. 348   2021-07-26   
231-279 1 Big Rapids MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-11-15   
231-279 2 Big Rapids MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348   2020-02-10   
231-279 3 Big Rapids MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348   2021-06-18   
231-279 4 Big Rapids MI GDRPMIBLXDZ  5562 METROPCS, INC. 348   2021-10-15   
231-279 6 Big Rapids MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-11-15   
231-279 7 Big Rapids MI   145J TERRA NOVA TELECOM INC. 348   2024-02-14   
231-279 8 Big Rapids MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2020-11-20   
231-279 9 Big Rapids MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2020-11-20   

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.