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: 364

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-364 A Northport MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-364 0 Northport MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348   2021-12-09   
231-364 1 Northport MI BRSPMI091MD  939H COMMIO, LLC 348   2022-12-01   
231-364 2 Northport MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2022-03-04   
231-364 4 Northport MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-08-15   
231-364 5 Northport MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-08-15   
231-364 6 Northport MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348   2021-08-16   
231-364 7 Northport MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348   2021-11-22   
231-364 8 Northport MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348   2021-11-22   
231-364 9 Northport MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2023-01-05   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.