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: SXCYIADT9MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
712-214 A Ashton IA 221F ONVOY, LLC - IA 630      
712-218 A Battle Creek IA 221F ONVOY, LLC - IA 630      
712-306 A Brunsville IA 221F ONVOY, LLC - IA 630      
712-312 A Pierson IA 221F ONVOY, LLC - IA 630      
712-315 A Struble IA 221F ONVOY, LLC - IA 630      
712-316 A Washta IA 221F ONVOY, LLC - IA 630      
712-397 A Whiting IA 221F ONVOY, LLC - IA 630      
712-403 A Sheldon IA 221F ONVOY, LLC - IA 630      
712-457 A Pierson IA 221F ONVOY, LLC - IA 630      
712-717 A Sioux City IA 221F ONVOY, LLC - IA 630      
712-900 A Holstein IA 221F ONVOY, LLC - IA 630      
712-955 A Merrill IA 221F ONVOY, LLC - IA 630      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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