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: CDRRIADTHMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-206 A Cedar Rapids IA 624H ONVOY SPECTRUM, LLC 635      
319-315 A Anamosa IA 624H ONVOY SPECTRUM, LLC 635      
319-370 A Coggon IA 624H ONVOY SPECTRUM, LLC 635      
319-387 A Central City IA 624H ONVOY SPECTRUM, LLC 635      
319-515 A Cedar Rapids IA 624H ONVOY SPECTRUM, LLC 635   2024-02-07   
563-540 A Waukon IA 624H ONVOY SPECTRUM, LLC 635      
563-550 A Calmar IA 624H ONVOY SPECTRUM, LLC 635      
563-560 A Lansing IA 624H ONVOY SPECTRUM, LLC 635      

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

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