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: 508

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-508 A Onekama MI TRCYMIMNLMD  392F KALEVA TELEPHONE COMPANY - MI 348      
231-508 0 Onekama MI TRCYMIMNLMD  392F KALEVA TELEPHONE COMPANY - MI 348      
231-508 1 Onekama MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-508 2 Onekama MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-508 3 Onekama MI GDRQMIBODS0  7157 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 348      
231-508 4 Onekama MI TRCYMIMNWMD  508J CENTURYLINK COMMUNICATIONS, LLC 348      
231-508 5 Onekama MI GDRPMIBL15Z  516C AT&T CORP. 348      
231-508 6 Onekama MI GDRPMIBL06Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 348      
231-508 7 Onekama MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-508 8 Onekama MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      
231-508 9 Onekama MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.