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: DVNPIADTGMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-246 A Fort Madison IA 221F ONVOY, LLC - IA 634      
319-250 A Fort Madison IA 221F ONVOY, LLC - IA 634      
563-208 A Muscatine IA 221F ONVOY, LLC - IA 634   2024-01-08   
563-278 A Clinton IA 221F ONVOY, LLC - IA 634      
563-281 A Muscatine IA 221F ONVOY, LLC - IA 634      
563-291 A Dubuque IA 221F ONVOY, LLC - IA 634      
563-293 A Davenport IA 221F ONVOY, LLC - IA 634      
563-661 A Maquoketa IA 221F ONVOY, LLC - IA 634      
563-666 A Walcott IA 221F ONVOY, LLC - IA 634      
563-723 A Davenport IA 221F ONVOY, LLC - IA 634      
563-726 A Davenport IA 221F ONVOY, LLC - IA 634      

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

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