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: 674

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-674 A Grant MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348      
231-674 0 Grant MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348      
231-674 1 Grant MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-674 2 Grant MI GDRPMIBL15Z  516C AT&T CORP. 348      
231-674 3 Grant MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-674 4 Grant MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348      
231-674 5 Grant MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348      
231-674 6 Grant MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348      
231-674 7 Grant MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-674 8 Grant MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-674 9 Grant MI GDRPMIQLX5Y  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 348      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.