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: SXCYIADTYMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
712-514 9 Spencer IA 321J HD CARRIER LLC 630   2019-12-26   
712-812 A Sioux City IA 321J HD CARRIER LLC 630   2025-08-29   
712-812 7 Sioux City IA 321J HD CARRIER LLC 630   2025-08-29   
712-812 8 Sioux City IA 321J HD CARRIER LLC 630   2025-08-29   
712-812 9 Sioux City IA 321J HD CARRIER LLC 630   2025-08-29   

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

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