Local Calling Guide

Area code/prefix search

Search by area code/prefix (NPA/NXX) or OCN

  • 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.

Last updated: Sat, 26 Jul 2014 03:21:21 UTC

How to use this page

Switch: WLVRMIMNRSA

See all switches at this location

NPA-NXX BLOCK Rate Centre Region OCN LATA Eff date Disc date Map
231-525 A Wolverine MI 9323 AMERITECH MICHIGAN [link] 348 map


Sponsored by: Callcentric - VoIP Internet phone service