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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Alfalfa, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
580-637 A CARNOKXADS0  1976 CARNEGIE TEL. CO. 536      

Last updated: Sun, 01 Nov 2026 02:11:49 UTC

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