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.

NPA: 303 [Rate centres in NPA 303] [Dial plan for NPA 303]

NXX: 596

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-596 A Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 0 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 1 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 2 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 3 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 4 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 5 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 6 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 7 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 8 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-596 9 Denver CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.