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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Enid, OK

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
580-977 1   9533 SOUTHWESTERN BELL 536      
580-977 2   9533 SOUTHWESTERN BELL 536      
580-977 3   9533 SOUTHWESTERN BELL 536      
580-977 4   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536      
580-977 5   9533 SOUTHWESTERN BELL 536      
580-977 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536      
580-977 7   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536      
580-977 8   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536      
580-977 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 536      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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