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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Newcastle, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
405-387 A NWCSOKXADS1  2018 PIONEER TEL. COOP., INC. 536      
405-392 A NWCSOKXBRS1  2018 PIONEER TEL. COOP., INC. 536      
405-852 A OKCZOKZCFMD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 536      
405-852 2 OKCZOKZCFMD  5257 LEVEL 3 COMMUNICATIONS, LLC - OK 536   2019-04-17   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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