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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OCN: 409F ONVOY, LLC - OK

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
918-999 A Tulsa OK TULSOKTBXHY  538      
918-999 9 Tulsa OK TULSOKTBXHY  538   2012-06-01   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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