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: RDOKIACORS6

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
712-623 A Red Oak IA 9631 QWEST CORPORATION 644      
712-623 2 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 3 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 4 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 5 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 6 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 7 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 8 Red Oak IA 9631 QWEST CORPORATION 644      
712-623 9 Red Oak IA 9631 QWEST CORPORATION 644      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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