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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 400

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-400 A Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 0 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 1 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 2 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 3 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-400 4 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 5 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 6 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-400 7 Denver CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
720-400 8 Denver CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
720-400 9 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.