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.

Switch: LNNGMIMN17Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-296 8 Montgomery MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2017-07-08   
517-695 1 Ransom MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2026-03-01   
517-793 1 Litchfield MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2012-10-05   
517-891 5 Frontier MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2026-02-22   
517-901 A Reading MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2025-02-13   
517-901 0 Reading MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2007-11-19   
517-919 9 Laingsburg MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2024-09-15   
517-932 0 Allen MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2017-07-22   
517-991 5 Camden MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2026-02-22   
517-995 1 Jonesville MI 792K CHARTER IP ENABLED SERVICES, LLC 346   2026-01-29   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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