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: 427

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-427 A Mackinaw City MI GDRPMIBL15Z  516C AT&T CORP. 348      
231-427 0 Mackinaw City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2013-01-03   
231-427 1 Mackinaw City MI TRCYMIMNVMD  116F PENINSULA FIBER NETWORK, LLC - MI 348   2015-06-18   
231-427 2 Mackinaw City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2012-06-01   
231-427 3 Mackinaw City MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2016-10-10   
231-427 4 Mackinaw City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2013-03-18   
231-427 5 Mackinaw City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2016-03-23   
231-427 6 Mackinaw City MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348   2015-09-15   
231-427 7 Mackinaw City MI GDRPMIBL15Z  516C AT&T CORP. 348   2011-10-01   
231-427 8 Mackinaw City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2016-03-23   
231-427 9 Mackinaw City MI BRSPMI09DS0  933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 348   2015-12-24   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.