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: 567

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-567 A Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348      
231-567 0 Muskegon MI MSKGMIXKQMD  624H ONVOY SPECTRUM, LLC 348   2021-07-11   
231-567 1 Muskegon MI MSKGMIXKQMD  624H ONVOY SPECTRUM, LLC 348   2021-07-11   
231-567 2 Muskegon MI MSKGMIXKQMD  624H ONVOY SPECTRUM, LLC 348   2021-07-11   
231-567 3 Muskegon MI GDRPMIBL31Z  5562 METROPCS, INC. 348   2021-05-02   
231-567 4 Muskegon MI MSKGMIXKQMD  624H ONVOY SPECTRUM, LLC 348   2021-07-11   
231-567 5 Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2021-01-08   
231-567 6 Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2021-01-08   
231-567 7 Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2021-01-08   
231-567 8 Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2021-01-08   
231-567 9 Muskegon MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348   2021-01-08   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.