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: ADBNIAXO0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
712-307 8 Avoca IA 593K MCC TELEPHONY LLC 644   2010-05-07   
712-404 1 Harlan IA 593K MCC TELEPHONY LLC 644   2010-05-07   
712-497 A Glidden IA 593K MCC TELEPHONY LLC 644      
712-497 1 Glidden IA 593K MCC TELEPHONY LLC 644   2010-05-07   
712-588 A Audubon IA 593K MCC TELEPHONY LLC 644      
712-588 1 Audubon IA 593K MCC TELEPHONY LLC 644   2010-04-16   

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

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