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: 444

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-444 A Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-444 0 Cadillac MI BRSPMI09DS0  933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 348   2015-12-21   
231-444 1 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2016-03-10   
231-444 2 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2016-03-10   
231-444 3 Cadillac MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348   2016-05-09   
231-444 4 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2015-10-19   
231-444 5 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2015-10-19   
231-444 6 Cadillac MI GFTPMIEF1MD  351D CHARTER FIBERLINK - MICHIGAN, LLC - MI 348   2016-06-15   
231-444 7 Cadillac MI   279B CLEAR RATE COMMUNICATIONS, INC. - MI 348   2016-08-31   
231-444 8 Cadillac MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348   2016-10-15   
231-444 9 Cadillac MI WYNGMIKAGT2  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2018-05-11   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.