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: 943

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-943 A Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 0 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 1 Traverse City MI   792K CHARTER IP ENABLED SERVICES, LLC 348   2012-09-03   
231-943 2 Traverse City MI   792K CHARTER IP ENABLED SERVICES, LLC 348   2013-06-07   
231-943 3 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 4 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 5 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 6 Traverse City MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-01-08   
231-943 7 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 8 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      
231-943 9 Traverse City MI GRWNMIMNRS0  9323 MICHIGAN BELL TEL CO 348      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.