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: CRWLOKMARS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
405-944 A Cromwell OK 9533 SOUTHWESTERN BELL 536      
405-944 1 Cromwell OK 9533 SOUTHWESTERN BELL 536      
405-944 5 Cromwell OK 9533 SOUTHWESTERN BELL 536      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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