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.
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Switch: HGTNMI084MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
906-200 A Iron Mountain MI 732J NUSO, LLC 342      
906-200 2 Iron Mountain MI 732J NUSO, LLC 342   2023-03-24   
906-200 3 Iron Mountain MI 732J NUSO, LLC 342   2023-12-11   
906-200 4 Iron Mountain MI 732J NUSO, LLC 342   2023-12-11   
906-200 6 Iron Mountain MI 732J NUSO, LLC 342   2024-11-15   

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

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