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: DVNPIADTXRX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-417 8 Fort Madison IA 515J IP HORIZON LLC 634   2025-08-14   
319-601 2 Burlington IA 515J IP HORIZON LLC 634   2025-07-29   
319-732 2 Keokuk IA 515J IP HORIZON LLC 634   2025-08-14   
563-208 0 Muscatine IA 515J IP HORIZON LLC 634   2025-08-21   
563-215 1 Clinton IA 515J IP HORIZON LLC 634   2025-08-21   
563-306 A Davenport IA 515J IP HORIZON LLC 634      
563-348 9 Dubuque IA 515J IP HORIZON LLC 634   2025-08-21   
563-657 0 Walcott IA 515J IP HORIZON LLC 634   2025-08-21   
563-661 7 Maquoketa IA 515J IP HORIZON LLC 634   2025-08-21   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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