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: CDRRIADTXAX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-243 4 Cedar Falls IA 515J IP HORIZON LLC 635   2025-07-25   
319-281 8 Hudson IA 515J IP HORIZON LLC 635   2025-08-14   
319-303 8 Denver IA 515J IP HORIZON LLC 635   2025-08-14   
319-305 9 Mount Vernon IA 515J IP HORIZON LLC 635   2025-08-14   
319-317 A Cedar Rapids IA 515J IP HORIZON LLC 635      
319-370 1 Coggon IA 515J IP HORIZON LLC 635   2025-08-15   
319-405 2 Anamosa IA 515J IP HORIZON LLC 635   2025-07-25   
319-407 8 Waverly IA 515J IP HORIZON LLC 635   2025-08-15   
319-410 5 Oelwein IA 515J IP HORIZON LLC 635   2025-08-15   
319-441 8 Center Point IA 515J IP HORIZON LLC 635   2025-08-15   
319-468 2 Independence IA 515J IP HORIZON LLC 635   2025-08-14   
319-492 9 Iowa City IA 515J IP HORIZON LLC 635   2025-08-14   
319-496 1 Monticello IA 515J IP HORIZON LLC 635   2025-08-14   
319-502 0 Waterloo IA 515J IP HORIZON LLC 635   2025-08-15   
319-719 1 Vinton IA 515J IP HORIZON LLC 635   2025-08-15   
319-910 4 Parkersburg IA 515J IP HORIZON LLC 635   2025-08-15   
563-294 6 West Union IA 515J IP HORIZON LLC 635   2025-08-21   
563-540 7 Waukon IA 515J IP HORIZON LLC 635   2025-08-21   
563-550 9 Calmar IA 515J IP HORIZON LLC 635   2025-08-21   
563-560 0 Lansing IA 515J IP HORIZON LLC 635   2025-08-21   
563-644 0 Decorah IA 515J IP HORIZON LLC 635   2025-08-21   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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