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: 501 [Rate centres in NPA 501] [Dial plan for NPA 501]

NXX: 610

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
501-610 A Cabot AR   348F ONVOY, LLC - AR 528   2026-10-03   
501-610 0 Cabot AR   348F ONVOY, LLC - AR 528   2026-10-03   
501-610 1 Cabot AR   196F BANDWIDTH.COM CLEC, LLC - AR 528   2026-10-05   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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