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: DVNPIADT6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
563-451 A Dubuque IA 7421 AT&T - LOCAL 634      
563-451 1 Dubuque IA 7421 AT&T - LOCAL 634      
563-499 A Davenport IA 7421 AT&T - LOCAL 634      
563-499 9 Davenport IA 7421 AT&T - LOCAL 634      
563-845 A Dubuque IA 7421 AT&T - LOCAL 634      
563-845 4 Dubuque IA 7421 AT&T - LOCAL 634   2009-06-04   
563-845 5 Dubuque IA 7421 AT&T - LOCAL 634   2009-06-04   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.