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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-999 1 Central Lake MI GDRPMIBL00Z  991E BANDWIDTH.COM CLEC, LLC - MI 348      
231-999 2 Central Lake MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-999 3 Central Lake MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-999 5 Central Lake MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348      
231-999 7 Central Lake MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348      
231-999 8 Central Lake MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-999 9 Central Lake MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.