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: 5257 LEVEL 3 COMMUNICATIONS, LLC - OK

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
918-992 3 Tulsa OK TULTOKCL8MD  538   2014-07-24   
918-992 4 Tulsa OK TULTOKCL8MD  538   2014-07-24   
918-992 6 Tulsa OK TULTOKCL8MD  538   2014-09-13   
918-992 7 Tulsa OK TULTOKCL8MD  538   2014-09-13   
918-994 A Broken Arrow OK TULTOKCL8MD  538      
918-994 0 Broken Arrow OK TULTOKCL8MD  538   2008-06-27   
918-994 1 Broken Arrow OK TULTOKCL8MD  538   2008-06-27   

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Last updated: Sat, 02 May 2026 12:20:53 UTC

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