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: DUBQIATCDS0

Remotes:

Switch Switch name Switch type
DUBQIANWRS5  DUBUQUE NORTHWEST  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
563-556 A Dubuque IA 9631 QWEST CORPORATION 634      
563-557 A Dubuque IA 9631 QWEST CORPORATION 634      
563-582 A Dubuque IA 9631 QWEST CORPORATION 634      
563-583 A Dubuque IA 9631 QWEST CORPORATION 634      
563-584 A Dubuque IA 9631 QWEST CORPORATION 634      
563-585 A Dubuque IA 9631 QWEST CORPORATION 634      
563-587 A Dubuque IA 9631 QWEST CORPORATION 634      
563-588 A Dubuque IA 9631 QWEST CORPORATION 634      
563-589 A Dubuque IA 9631 QWEST CORPORATION 634      

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

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