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: 227

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-227 A Honor MI   792K CHARTER IP ENABLED SERVICES, LLC 348      
231-227 0 Honor MI   770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2020-12-04   
231-227 1 Honor MI   792K CHARTER IP ENABLED SERVICES, LLC 348      
231-227 2 Honor MI   543C ONVOY, LLCV - MI 348   2019-09-05   
231-227 3 Honor MI   543C ONVOY, LLCV - MI 348   2020-05-09   
231-227 4 Honor MI   543C ONVOY, LLCV - MI 348   2020-05-09   
231-227 5 Honor MI   543C ONVOY, LLCV - MI 348   2020-05-09   
231-227 6 Honor MI   543C ONVOY, LLCV - MI 348   2020-05-09   
231-227 7 Honor MI   6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348   2015-09-15   
231-227 8 Honor MI   543C ONVOY, LLCV - MI 348   2020-09-12   
231-227 9 Honor MI   543C ONVOY, LLCV - MI 348   2020-09-12   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.