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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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
989-361 A Auburn MI 478J NUSO, LLC 344      
989-361 1 Auburn MI 478J NUSO, LLC 344   2020-11-08   
989-361 5 Auburn MI 478J NUSO, LLC 344   2023-12-11   
989-361 6 Auburn MI 478J NUSO, LLC 344   2023-12-11   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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