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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Allison, AR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
870-585 A ALSNARXARS0  1712 MOUNTAIN VIEW TELEPHONE COMPANY 528      

Last updated: Sun, 17 May 2026 03:26:51 UTC

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