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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: OKCYOKCEXSZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
405-998 A Oklahoma City OK 321J HD CARRIER LLC 536      
405-998 9 Oklahoma City OK 321J HD CARRIER LLC 536   2020-04-03   
572-250 5 Oklahoma City OK 321J HD CARRIER LLC 536   2025-11-27   
572-250 6 Oklahoma City OK 321J HD CARRIER LLC 536   2025-11-27   
572-250 7 Oklahoma City OK 321J HD CARRIER LLC 536   2025-11-27   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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