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: FTSMAR08DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
479-590 A Fort Smith AR 578H AIRUS, INC. - AR 526   2026-04-19   
479-590 1 Fort Smith AR 578H AIRUS, INC. - AR 526   2026-04-19   

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

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