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: DNVRCOMADS8

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-356 A Denver CO 7421 AT&T - LOCAL 656      
720-356 3 Denver CO 7421 AT&T - LOCAL 656      
720-356 5 Denver CO 7421 AT&T - LOCAL 656      
720-356 6 Denver CO 7421 AT&T - LOCAL 656      
720-356 7 Denver CO 7421 AT&T - LOCAL 656      
720-356 8 Denver CO 7421 AT&T - LOCAL 656      
720-356 9 Denver CO 7421 AT&T - LOCAL 656      
720-587 A Denver CO 7421 AT&T - LOCAL 656      
720-587 0 Denver CO 7421 AT&T - LOCAL 656      
720-587 3 Denver CO 7421 AT&T - LOCAL 656      
720-587 4 Denver CO 7421 AT&T - LOCAL 656      
720-587 6 Denver CO 7421 AT&T - LOCAL 656      
720-663 3 Denver CO 7421 AT&T - LOCAL 656   2008-07-20   
720-663 4 Denver CO 7421 AT&T - LOCAL 656   2008-07-20   
720-663 5 Denver CO 7421 AT&T - LOCAL 656   2008-07-20   
720-663 6 Denver CO 7421 AT&T - LOCAL 656   2008-07-20   

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

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