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: SXFLSDPSDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-991 A Milbank SD 580H AIRUS, INC. - SD 640      
605-991 1 Milbank SD 580H AIRUS, INC. - SD 640   2021-05-22   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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